add windowswap extension
Add buffer_idx_mode to vim-airline.
Update documentation.
Keep buffer index-id map a script scope variable.
Merge pull request #589 from paulhybryant/master

Minor enhancement for tabline
Merge pull request #598 from wesQ3/pr

Added extension for wesQ3/vim-windowswap
improve buffer index mode and fix usages where there's overflow
Handle special characters in part conditions
Merge pull request #603 from kballard/part_condition_special_char

Handle special characters in part conditions
Merge remote-tracking branch 'upstream/master'