introduce accents into the color palette.
fix unit tests.
correctly inject the accent highlight groups.
tests for configuring accents directly.
populate all modes with accent colors.
add test for populate accent colors.
automatically provide the red accent.
add additional accents by default.
Merge branch '203' into dev. Resolves #203.
support multiple accents in the same section (#203).
add bold and italic accents.
give the line number a bold accent by default.
Show current buffers in the middle of the tabline (bling/vim-airline#222)
Merge pull request #266 from toupeira/222

 Show current buffers in the middle of the tabline
remove comment about file length, as it is already proper.
Merge branch 'dev'