Merge pull request #10 from ecomerc/master

Added methods to filter requests
* 3.0.6.0
	* Added "tolower" function (thanks petero-dk!)
	* Added "startswith", "endswith" and "toupper"
	* Fixed issue when calling functions passing a field name as second parameter.
	* Added tests for substringof and tolower
Merge pull request #1 from endaroza/master

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