Merge pull request #99 from dongilbert/staging

Updating README documentation.
Exclude some files we only need in the repository from the ZIP files generated by GitHub.
Remove some workarounds for older PHP 5.3 versions.
Merge pull request #104 from realityking/php53

Remove some workarounds for older PHP 5.3 versions.
Merge pull request #103 from realityking/export

Exclude some files we only need in the repository from the ZIP files gen...
Merge branch 'staging' of github.com:joomla/joomla-framework into staging