UI: Remove minimum container height

Depends on !1953

See the commits for more details, the messages mostly speak for themselves.

Before:

![Screen_Shot_2015-12-02_at_15.42.07](/uploads/1d8e19e4738bec39074cbb9afc400ad5/Screen_Shot_2015-12-02_at_15.42.07.png)

After:

![Screen_Shot_2015-12-02_at_15.50.34](/uploads/56153fe19bb72163a2dc9dd83850ad89/Screen_Shot_2015-12-02_at_15.50.34.png)


See merge request !1957