Remove os_msdos.txt due to dropped MS-DOS support
Runtime: Support Arch Linux/Pacman file types.
upgrade luarocks

ref #822
vim-patch:7.4.220

Problem:    Test 105 does not work in a shadow dir. (James McCoy)
Solution:   Omit "src/" from the checked path.

https://code.google.com/p/vim/source/detail?r=v7-4-220
Set the policy to 'OLD' to avoid warning CMP0026 in CMake 3.0.
Merge #954 'Fix the policy warning CMP0026 in CMake 3.0.'
CMake: Generate helptags during install step.

Fix #1056.
Merge #1106 'CMake: Generate helptags during install step.'
CMake: Use DESTDIR for helptags generation.
Merge #1110 'CMake: Use DESTDIR for helptags generation.'
coverity/62620: fix uninitialized scalar variable
Spelling fixes
Merge pull request #1093 from paulburlumi/coverity-62620

coverity/62620: fix uninitialized scalar variable
Merge pull request #1111 from epmatsw/spellcheck2

More Typo Fixes
Merge pull request #1104 from Hinidu/vim-patch-7.4.220

vim-patch:7.4.220
Merge pull request #1082 from fornwall/remove-os-msdos-txt

Remove os_msdos.txt due to dropped MS-DOS support
Merge pull request #1087 from fwalch/archlinux-filetypes

Runtime: Support Arch Linux/Pacman file types.
Remove version{4,5,6,7}.txt
Update CONTRIBUTING.md and README.md #740

- recommend task/subtask convention for commit messages
Merge pull request #1116 from fornwall/remove-versions-txt

Remove version{4,5,6,7}.txt