Add "New Proposition" button
Use subtle gradient for button
Allow proposition target for commits
Add Propositions module

This provides methods to commit a proposition, and
get proposition resources by hashes, or the most recent.
Cleanup error handling in resource modules
Add routes for publishing propositions
Tweak width of argument editor
Tweak placeholders in argument editor
Tweak buttons in argument editor
Update API docs for publishing propositions
Fix typo for module name in propositions test
Add Publications module
Cleanup docs for resource collections
Show publications on public user pages
Simplify method call to storage in publications
Include search results for propositions
Update changes file
Update API docs
Update superagent to 0.15.7

This fixes app tests on node 0.10, which failed semi-deterministically
by timeout since the max sockets for the http agent would be reached
after a certain number of tests had run.

This can be fixed by increasing the max sockets (default is 5),
or disabling the agent as superagent chose to do.
Version 0.1.2