use alt-g for filter bufferlist

this is more consistent with the other existing shortcuts and is also
the same shortcut go.py recommends in weechat-curses
use consistent format to explain shortcuts
make enter switch to the first match in the list
Notifications: Improve channel detection
Merge pull request #167 from tribut/mimic-go-py

Make buffer filter more keyboard friendly
Reinitialize context when relay closes connection

Fixes #73
Merge pull request #168 from lorenzhs/notifications

Notifications: Improve channel detection
Merge pull request #166 from torhve/swipe-animate

Use ngAnimate to animate sidebar hiding/showing
Merge pull request #169 from cormier/fix-73

Reinitialize context when relay closes connection
Set container to panel