Update php.json

Update to the latest version of PHP, 5.5.7.
Merge pull request #49 from jkrehm/update-php

Update php.json
add MSI extraction, deprecate MSI install (see issues #16, #18)
Merge branch 'master' of https://github.com/lukesampson/scoop
7zip 9.20 (use new MSI extract method instead of running full install, see #16)
python 3.3.3
python 2.7.6 (uses new MSI extract method)
vagrant 1.4.1
vim 7.4 (add libraries for better language support)
depends: don't include the requested app in the list of dependencies
install: auto-install dependencies
Add creation of '$dir\$extract_to' directory in install.ps1

When the source is a file, Copy-Item expects the destination
to be a file or directory that already exists. So create dir
if needed.
Merge pull request #51 from amatashkin/createdir

Add creation of '$dir\$extract_to' directory in install.ps1
fix prune_installed function