Whitespace fixes
Merge pull request #1142 from GrahamCampbell/tweaks

Whitespace Fixes
Merge branch '3.7' into 4.0
Merge branch '4.0' into 4.1
Merge branch '4.1'
Don't Overwrite Already Existing Environment Vars

Closes #1181

If a variable is already set via `putenv` or if the variable is already
present in the `$_ENV` array, it will no longer be ovewritten by
`PHPUnit_Util_Configuration::handlePHPConfiguration`.

This allows users to pass in environment variables fia the command line
in the usual ways:

    bash$ SOME_VAR="a value" ./path/to/phpunit
Merge branch '4.0' into 4.1
Merge branch '4.1'
Initial work on #913
Implement first batch of configuration flags for #913
More configuration flags for #913
More work on #913
More work on #913
More work on #913
More work on #913
More work on #913
More work on #913
More work on #913
More work on #913
More work on #913