CHG: the function comments to match the code guidelines

git-svn-id: https://php-sql-parser.googlecode.com/svn/trunk@1327 44dcfd11-89b7-3d55-2063-5c365055f77f
ADD: adds the method getCustomFunctions() which returns an array of all defined custom functions.

git-svn-id: https://php-sql-parser.googlecode.com/svn/trunk@1328 44dcfd11-89b7-3d55-2063-5c365055f77f
Merge branch 'svnsync'

ADD: namespace aliases
ADD: a new function getCustomFunctions() in PHPSQLParserConstants