Rename lazy to lazy' to avoid lens name clash

It seems to have been added since 4.0.
Style only
Revert "Style only"

This reverts commit 328da20fac8825f99e3170e6619bdaa10923426d.

NoMonomorphismRestriction apparently
Ask travis to use GHC-7.8.1.
Use operators defined in Yi.Keymap.Keys more
Don't use StandaloneDeriving in Yi.Buffer.Basic
Remove singleton from Yi.Utils
Remove list from Yi.Utils
Remove dummyGet and dummyPut from Yi.Utils