Td string xpath

[duongnt]

Use string() xpath function to convert the first item of node-set to a string, instead of getting the node-set and extract the first item in python.

This fixes #46

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(b) The contribution is based upon previous work that, to the best of my knowledge, is covered under an appropriate open source license and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open source license (unless I am permitted to submit under a different license), as indicated in the file; or

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Signed-off-by: Thi Duong Nguyen (thiduongnguyen@gmail.com)

[distortedsignal]

I'm not sure what's going on here - it looks like you did work, and I can see that you've made the PR, but the number of changed files is... 0? Could you do a git diff origin/td-string-xpath?

[duongnt]

sorry let me put up another pull request.