Merge pull request #104 from dougblack/panes

add pane switch commands
Add changelog for #104
Merge pull request #77 from dougblack/H-L-M

add H, L, and M
Add changelog for #77
Prepare for 0.8.0
Prepare 0.8.0 release
Add splits to README
add ctrl-e and ctrl-y
add docs for scrolling
use same destruction style as the rest of package
better method names
change location of new commands in cson
consistent whitespace
remove unused imports
use screen coordinates
add specs for scrolling