Revert "[BUGFIX] <th> text-align center"

This reverts commit 9cfbe4290c493f19f9af63c9c0442c7e85097551.
Revert "Remove CSS styles for Show/Hide controls"

This reverts commit 6263f5a156ae8705f4fd6d23b15612e2be0e4341.
Revert "[BUGFIX] nav - add margin-bottom"

This reverts commit 070ad29876b8e5010109788b087b018d2845e33a.
Revert "Remove unused nav styles"

This reverts commit 87bd1f8ab1f4f9399de6e91cf08a44566a9b8b2c.
Revert "[BUGFIX] nav - add padding-left"

This reverts commit 8f7f20aa30ab192e5bf1249496c7277e714954bf.
Revert "[BUGFIX] nav - add margin-right between icon and text"

This reverts commit 68e933abeec0cca949ae45047ca8ee5084c6c406.
Revert "[BUGFIX] Add padding-top to nav"

This reverts commit c508d552fc21096b84fa97d309dd2851fa9f6e4d.
Revert "Use Bootstrap - start by changing nav to use Bootstrap"

This reverts commit 548c4a4b15cd028a6643ed8908d3d7c7c9a0d318.
select2 - upgrade to 3.4.8

Fixes https://github.com/ivaynberg/select2/issues/2267

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>