Gallery view added to Explore OSB tab fixes #40
Refactor to tabs in Explore OSB with two main purposes:
1) They can be directly linked (/projects#tabName)
2) Better performance as each tab is loaded independently and the first
tab to be loaded is the one which will be displayed. Besides, the
controller has been optimised to load only the variable needed for the
tab. (some more work can be done on this as some variables can be stored
in session)