Fix usebanner and default grunt build

Previously, the dist files banner would be lost when running grunt watch
(because usebanner wouldn't be called). This makes sure it's called after
changes to dist files.

It also fixes other small problems in the default grunt build - adds clean
to the start of the grunt task, and adds uglify in some places to make sure
the min js file actually gets updated. Should fix a few build frustrations.
Fix rendering issue in Linux Chrome v38

The Chrome update made rows a tiny bit wider, so that non-fixed columns are forced to "wrap to the next line"... but the "next line" is below everything in the fixed columns! See http://stackoverflow.com/questions/26495735/google-chrome-rendering-floated-text-on-multiple-lines.

This is probably a hack, but forces the text not to wrap. This should be ok because ember-table computes and sets widths.
Link to new version of charts/widgets docs.

Also, use consistent ordering.
Release 0.2.3
Fix ember-table with Ember.EXTEND_PROTOTYPES=false

Fixes https://github.com/Addepar/ember-table/issues/224
Allow bower to pull in the src directory.

This allows users to import LESS files directly and override variables, without
adding LESS files to the dist folder.

Tweak the other bower ignores as well (you can't ignore bower.json, CHANGELOG.md
and CONTRIBUTING.md should have been ignored already).
Fix formatting error in CHANGELOG.md
Fix Ember.Set deprecation warnings

Signed-off-by: Alessandro D'Aquino (elara) <alex@midokura.com>
Default Mode: New column resizing, part 1

This is a work in progress and will not be merged into master without
discussion of the new spec.

* Avoid reszing columns to widths less than 0, which breaks the table
* New behavior uses canAutoResize when forceFill is off.
* Use iterative resizing to compute column widths in case of min/max
  width issues
* Removed 500px limit on max width during resize
Clean up demo pages and rename to auto-resize
Fluid mostly works
WIP mostly working buggy reordering
Reordering and unresizable columns work! WIP
Remove debug
Added configuration container. WIP.
WIP pretty good but something broke =(
Whew found it
Demo basically works
Nicely styled demo
Respectable demo