First alpha release for GitNotes

What works:

• Cloning repository over HTTPS.
• Staging and un-staging files
• Committing and pushing.
• Traversing repositories
• Opening markdown documents
• Opening other files in different apps using Intent API.

Whats broken:

• Un-staging files that were deleted since last commit.
• App crashes if an image in the markdown window doesn't exist.
• Message provided during pull seems to be broken.
• You tell me!