Keep message/command history for each channel

* Can be navigated with up/down arrow keys
* Currently entered text is preserved when going into history
* When choosing a history entry, previously entered but not submitted text will be restored to input buffer

Closes #75
Remove files no longer needed due to use of Bower
Merge pull request #95 from lorenzhs/history

Keep message/command history for each channel
Merge pull request #96 from lorenzhs/bower

Remove files no longer needed due to use of Bower
Improve feedback
try to improve scrolling experience
Remove autofocus since it is very mobile unfriendly
Consume less space on mobile
Improve mobile layout

* more densely packed channel switching buttons (increased their size to better match android design guidelines)
* disable zooming
* disable scrolling to the side
Merge branch 'mobile' into gh-pages