Fix admin constraints

It was not working because the data that we passed was not a string and
didn't end up being visible through the template;
Added blockui jquery plugin and display it for proposal save and apply
Merge pull request #871 from vuntz/admin-constraints

Fix admin constraints
Removed each for blockui call and moved it down to the other live calls
Merge pull request #873 from tboerger/feature/blockui

Added blockui jquery plugin and display it for proposal save and apply