Add button to count watcher and debug mode

Performance issues are mainly caused by spurious angularjs watchers.
This debug mode provides a button to display the number of registered
watchers in the console.
Add bindonce and remove 50% of the watchers in the buffers
Use bower for dependency management
Merge pull request #93 from lorenzhs/bower

Use bower for dependency management
Add bower instructions
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
Add Dockerfile