Extract ParseSize from juju/instance

The ParseSize function will be used to parse
the size in storage specifications.
Merge pull request #82 from axw/utils-parsesize

Extract ParseSize from juju/instance
Fixed lp:1394524 - apt-get retry should not call CombinedOutput twice
Merge pull request #91 from dimitern/lp-1394524-fix-apt-retry

Fixed lp:1394524 - apt-get retry should not call CombinedOutput twice
Created MakeFileURL function that creates a proper file:// URL for both
platforms
Merge pull request #45 from bogdanteleaga/environs

Fixed http transport for windows compatibility
Changed file.Chmod with os.Chmod because file.Chmod fails horribly on windows
Merge pull request #92 from bogdanteleaga/tar-fix

Changed file.Chmod with os.Chmod because file.Chmod fails horribly on wi...
Fix un-anchored IsValidUUIDString regex
One more test
Better representation of the regex
Add feature flags.
Fix license
Merge pull request #94 from johnweldon/0-isvaliduuidstring-fix

Fix un-anchored IsValidUUIDString regex
Merge pull request #95 from howbazaar/featureflags

Add feature flags.