Pixel pushing possible changes

Rename to F12 Change Detection
Added browser shortcut to take changes CTRL+ALT+T
Added browser shortcut to continuously deliver changes CTRL+ALT+U
Added browser specific take changes button in browserlink dashboard
Extension disconnection handling
Prevented addition of properties with values of "initial" or some
multiply specified set of "initial"s
Some refactoring and cleanup
Merge remote-tracking branch 'upstream/master'
Pixel pushing menu items

Added a few things to Menu as well (enable/disable/updated checked)
Nested the checkbox in its label to make it clickable since 'for'
doesn't set properly for some reason
Capitalized 'I' in tooltip for the shortcut for inspect mode
Merge remote-tracking branch 'upstream/master'
Renamed buttons for pixel pushing in menu
Merge pull request #96 from mlorbetske/master

Pixel pushing mode rename, feature changes & menu updates