Merge pull request #176 from seletskiy/solarized-contrast-fix

solarized: fix contrast and warningmsg
fix whitespace toggle command (#177).
prefer function name instead of funcref.
improve algorithm for inactive colors. resolves #178.
add error code 1 for easier override.
fix undotree override bleeding over to the main.
pass context into the builder.
inactivate existing statusline without building a new one.
improved unite integration (#165).
give the light theme inactive mode some more color.
fix bufferline integration
match up bufferline colors with the gutter.
Revert "inactivate existing statusline without building a new one."

This reverts commit 53b856b0c5f159f65c512621a7539fd0a37d7546.
add inactive statusline funcrefs into the pipeline.
convert the highlighter into a singleton.
remove hackfix and use new tagbar statusline integration.

requires https://github.com/majutsushi/tagbar/commit/0b14e28719e83e70241521df013ffec33b73ca3e
add virtualenv extension
added base16.vim colorscheme
Merge pull request #181 from esn89/master

added base16.vim colorscheme
add base16 support for all variants.