Recreate args dictionary with str() arguments, use closures

Fixes #776
Merge pull request #781 from ZyX-I/segment-calls

Recreate args dictionary with str() arguments, use closures
Vim: add window_title function, used in quickfix theme

This is used to display the window title of the quickfix window. Both
Syntastic and Vim use this. See w:quickfix_title.
Make window_title work in older vims
Add window_title group to solarizedlight colorschem
Merge branch 'vim-window-title' into develop

Closes #703
Add &ts setting and comment regarding .local.vimrc usage
Merge branch 'local.vimrc' into develop

Ref #314