Fix issue #133 - increase mouse sensitivity

Mouse sensitivity has been improved with the update to the backend
object that handles all of these events.

Fixes #133
Merge pull request #244 from ElDeveloper/issue-133

Fix issue #133 - increase mouse sensitivity
Update the Travis-CI status badge
Change references from qiime to biocore
Fix links in the docs that would point to qiime
Add note about emperor living under biocore
Merge pull request #245 from ElDeveloper/biocore-updates

Biocore updates
Fix typo in `Vsibility` -> `Visibility`
Merge pull request #249 from ElDeveloper/typo

Fix typo in `Vsibility` -> `Visibility`
ENH: Add toggle visible button

The selected categories under the visibility tab can now be toggled
using the "Toggle Visible" button.
TST: Add tests to support toggle visibility button
ENH: Add callback to toggle category visibility

This callback will hide the categories that are visible and show the
categories that are hidden. With this change we needed a way to refer to
the table with the visibility widgets, hence a new identifier has been
added to it.

Fixes #145.
MAINT: Add note to ChangeLog.md re toggle visible
ENH: Add horizontal line to divide the widgets

An horizontal line now divides the elements under the Visibility and
Scaling tabs, this line separates the "per category" controllers from
the "global controllers".

The test suite was updated accordingly.
ENH: Change button name to Invert Selected

Thanks for the suggestion @teravest
Merge pull request #253 from ElDeveloper/issue-145

Add toggle visibility button
Merge branch 'master' of git://github.com/biocore/emperor into issue_150
STY: Major stylistic clean-up

Change the number of spaces in animate.js and trajectory.js, using now 2
spaces, which seems more standard all over the community (plus it fits
better in an 80 column window).

Rename some variables to make their role much more descriptive in the
code.