v0.0.11: Added Ninja generator, examples, Travis

Organization:
- moved examples from t/samples to eg/
- added example 002, which uses two C files!
- added example 003, which uses two C files **and two compile nodes**!

Code:
- Added first version of Ninja generator
- Commented out some unused imports
- Fixed bugs when run under Perl 5.18

Documentation:
- added POD to bin/hopen; updated POD in App::hopen
- corrected some references to Data::Hopen
- fixed POD in Ah::Gen::Make::AssetGraphVisitor and
  Ah::T::Gnu::C::LinkCmd

Dependencies:
- Specified version of Data::Dumper

Tests:
- Added Kwalitee test
- Added `use strict` to all modules since Kwalitee doesn't know that
  Data::Hopen::Base applies `use strict` automatically.
- Added Travis configuration; fixed Appveyor configuration
- Added a test of Check and Gen phases using eg/001.