Data.String: Add four functions to (pad_left, pad_right, pad_both_sides, pad_between_letters).
Data.String: Disambiguate a condition.
Data.String: Add a function (justify_equal_spacing).
list module names in 'What vital.vim provides'

module names should be better than 'vimproc', 'unite'.
Because they are not common with non-Japanese vimmers.
Fix document
Merge pull request #147 from crazymaster/doc

Fix document
Process: add shellescape()
Process: add comment
Process: allow {str} argument of List
Process: system(): escape for vimproc parser
Merge pull request #145 from vim-jp/improve-readme

List module names in 'What vital.vim provides'
add links to help (#145)
add note about vitalizer to README.md (#145)
Data.String: Fix spec file.
Readme: Better English
Readme: more about License
Readme: more about import
ProcessManager: remove deprecated stop() function (it has been deprecated since 36985f8)
ProcessManager: changelog
vitalizer: Prelude module becomes optional