improve scss compile performance

Now only scss-compile and css-lint the modified file.
fix #1469 - recreating deleted project
Merge pull request #127 from taigaio/bug/1469/reacreating-deleted-project-breaks

fix #1469 - recreating deleted project
Memberlist list fluid layout fix
Merge pull request #126 from taigaio/bug/1452/memberlist-layout

Memberlist list fluid layout fix
Merge pull request #124 from taigaio/bug/1387/sass-compile-performance

improve scss compile performance
Fixed typo
fix styles join
fix #1472
Add attachment limit size information on avatar and attachments
Catch errors with heavy files and show info messages about the maximum size allowed.