Bug fixes and one additional feature.

I fixed several issues:
1. The letters constraint would not accept upper-case letters.
2. The generated JavaScript included some extraneous commas that broke IE.
3. This plugin was incompatible with the Grails Melody plugin.
4. The remote validation call has not working properly for me. Making it synchronous fixed it.

I added one feature:
1. You can now specify the element that a qtip error message will be attached to, just by giving the target element in id which is the same as the input element with the word "Target" appended. This is useful in cases where the qtip would otherwise obscure an important part of the form.

I have been running this version for several weeks in production. It works. Please feel free to contact me if you have any questions. Thanks for reading!