This commit also removes the “import a single Trello card” as we couldn’t figure
out some reasonable use case.
We also create a new publication on the server to provide the minimal user
profile informations required to display an avatar.
The layout issue was related to the lack of autoprexing for CSS
properties. c69f993 did improve the reload time significantly but for
that I had to replace `mquandalle:stylus` by the core `stylus`
package. Unfortunatly it is currently difficult to run an autoprefixer
with the core CSS compilers (as reported in
https://github.com/meteor/meteor/issues/5219).
So instead we rely on `nib` which transparently define some mixins for
autoprefixing, the only restrictions being that we have to manually
`@import 'nib'` on top of stylus files.
Fixes#461
