Process Draft Inline Images to send properly

[tyochelson-lwhs]

Resolves Issue #163 -- handling of Inline Images varies between GmailDraft and GmailMessage classes; code changes convert attachments to inlineImages and update tags in HTML Body text to conform to updated usage.

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[tyochelson-lwhs]

@googlebot I signed it!

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[tyochelson-lwhs]

@googlebot I signed it!

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[tyochelson-lwhs]

@googlebot I signed it!

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[sqrrrl]

Superseded by #173