Update homebrew git link
Merge pull request #535 from hflynn/rebased/dev_4_4/mxcl_homebrew_link

Update homebrew git link (rebased onto dev_4_4)
Fixing broken source link
Merge pull request #540 from hflynn/rebased/dev_4_4/rebased/develop/11649

Adding JVM memory settings to main install docs (rebased onto develop) (rebased onto dev_4_4)