Merge branch 'release/0.4.1'

* release/0.4.1:
  Bump version.
Bump version.
Added ability to specify alt text on an image in kottiimage plugin.
Updated CHANGES.txt
Merge pull request #17 from neilferreira/master

Added ability to specify alt text on an image in kottiimage plugin.
Allows local files upload below custom content types.
Merge pull request #21 from castaf/master

Allows local files upload below custom content types.
Use the new ``kotti_context_url`` JS global variable if it is available.
Bump version.
Merge branch 'release/0.4.2' into production

* release/0.4.2:
  Bump version.
  Use the new ``kotti_context_url`` JS global variable if it is available.
  Allows local files upload below custom content types.
  Updated CHANGES.txt
  Added ability to specify alt text on an image in kottiimage plugin.
  Bump version.