Clean up some parts of the PKGBUILD for ttf-google-fonts-git

Add quotes around makedepends array item
Bump stated pkgver
Sort 'cantarell-fonts' conflict to the top of the conflicts array
Replace tabs with spaces in the conflicts array
Add missing "$1" in post_upgrade() function in font.install
Improve pkgdesc for ttf-google-fonts-git
Add 'ttf-font' to the provides array for ttf-google-fonts-git
Add missing dependencies for ttf-google-fonts-git

"xorg-mkfontdir" and "xorg-mkfontscale" were missing and are required
for successful completion of the post_install() function in font.install
Add missing conflicting packages for ttf-google-fonts-git

"adobe-source-sans-pro-fonts" and "adobe-source-code-pro-fonts" are now
packaged in [extra].

Refer to:
https://mailman.archlinux.org/pipermail/aur-general/2013-December/026262.html
Sort conflicts array and add 1 missing conflict for ttf-google-fonts-git

Sort part of the conflicts array alphabetically
Add missing conflict for 'ttf-google-fonts-hg'
Merge pull request #2 from jrstjohn/google-fonts-PKGBUILD-fixes

ttf-google-fonts-git PKGBUILD fixes