0.6.1: fixed 'mk' command

• nv_get_cpu_count: added support for OSX: #4
• mk command: added reset for plug_check_deps
• fixed make uninstall & added it into README

0.6.0: new commands (use, do), new plugin (haskell) & other improvements

• added use command as synonym to activate/on
• added functions for plugin: plug_unpack & plug_configure
• fixed plug_install_default: it works with any file ext, not only .tar.gz
• command mk: improved logic of the creation of the environment
• added function for plugin: plug_download
• erlang-plugin: fixed sorting for ls-versions
• added to all functions from nv_common module prefix nv_
• added do command
• added option --on for mk command to active env after installation
• improved files downloading (nv_download_file):
  • used custom user-agent
  • used options for continue downloading if it was interrupted
• added option --no-meta for ls command
• improved environment's name autocompletion for rm/on/activate/use
• added function plug_check_deps for checking dependencies before plugin building
• added plugin for haskell

0.5.2: Fixed node.js plugin

• added common function: nv_get_build_path
• mk: used nv_get_build_path
• mk: passed plugin version into plug_post_install_actions
• node-plugin: packages installed via npm are stored in environment's dir, not build's dir

0.5.1: Package managers for python/erlang & bugfix for 'mk'

• added plug_post_install_actions function for plugins
• removed plug_add_activate_script (used plug_post_install_actions instead)
• python-plugin: added python symlink creation
• python-plugin: added pip installation
• erlang-plugin: added rebar installation
• rust-plugin: fixed sorting for ls command
• fixed mk: plug_install did not reset to default state for each plugin

0.5.0: Python plugin, improved autocomplete, bugfixes, some renamings again

• mk commands can store meta info about used plugins
• ls-envs can to read meta info
• improved autocomplete for mk/ls-versions
• improved go plugin: added GOPATH into activation script
• added plugin for python
• added plug_add_activate_script function for plugins
• added call for 'deactivate-' scripts during off/deactivate commands
• fixed go plugin: restore old values for GOROOT/GOPATH after
  deactivation of an environment
• fixed go plugin: improved activate-go content to be usabale after copy
• rm-envs output message if environment was successfully deleted
• ls-envs added environments sorting
• ls-envs renamed to ls (back)
• rm-envs renamed to rm (back)
• improved autocompletion for rm command

Commands renaming, autocompletion, plugin for #golang

• fixed on command if env's name is not entered
• activate/on commands: add env's name into prompt by default
• commands renamed to ls-commands
• ls renamed to ls-envs
• plugins renamed to ls-plugins
• rm renamed to rm-envs
• version renamed to ls-versions
• added command ls-cache
• added command rm-cache
• added autocompletion
• added plugin for go

New commands & one new plugin

• mk command accept empty environment name and generate it accordingly to plugins
• added cp command for copying environments
• added mv command for renaming environments
• improved julia plugin (copied binaries are not simlinks on them anymore. importamt for cp command)
• fixed error message if environment is not entered for on/activate commands
• added option --prompt-enable for on/activate commands
• added plugin for node.js

Some improvements & new plugins

• plug_install is not mandatory function in the plugin file.
• Added plug_url_for_download as replacement of the plug_install
  in plugin body. Plugin's body now more easy to read/write.
• Added tests for the most functions from nv_common.
• Fixed download_file from nv_common: curl accounts redirects.
• Standardized way to store archives in mk command.
• Added plugin for elixir.
• Added plugin for julia.

Initial release

Base functionality.