Adding tig description to .tigrc
Adding the "MOST" pager to brew install list
Creating separate osx_app.sh script for non-default app prefs

Also adding setting for secret iTerm2 preference for alternate
scrolling.

Splitting osx.sh and osx_apps.sh provides a better distinction between
preferences for a fresh default install of OS X and preferences for
applications that need to be installed separately. As part of this
process, moving the aliasing of iOS Simulator to the new osx_app.sh
script since it requires Xcode to be installed on fresh copies of OS X.

Also adding a new task in the manuelfile
Using iterm2-nightly rather than iterm2 cask
Updating customize_icons.rb for iterm2-nightly

Also adding command to touch the .app directory to refresh the icon
cache