Cast Parameters

Cast paramenters to int
Checking is_numeric() and returning Exception if not
Cating values on processLimit() and processOffset()
Travis Indentation Fixes
Exception Message Changed
Thanks to @Martin-P
Travis Trailing Spaces Fixes
Consistency Fixes
Merge branch 'hotfix/4562'

Close #4562
PR #4568
Merge branch 'zend_db_select_cast_limit_and_offset' of git://github.com/pauloelr/zf2 into pauloelr-zend_db_select_cast_limit_and_offset
Zend\Db\Sql\Select
Added tests for limit/offset int handling
Added functionality to MysqlPlatform handler
Forward #4568 to develop
Merge branch 'pauloelr-zend_db_select_cast_limit_and_offset' into develop