Fixes retrieval of version string from source files doc blocks (fixes #36)

[santilin]

In the issue there is a suggestion to refactor code from the i18n command. However, the code in the i18n command can't be used as is because it only handles functions, and the plugin.php header doesn't have to have a function on it.

I have replaced the former preg_match on the contents of all the php files in the plugin into a more sophisticated way of extracting the version tag:

• Use php's token_get_all to parse the php file
• For each doc_block, parse it to get all the tags
• return the version tag.

It's worth noting that the tags might be specified as @version or Version: and that a leading * might be in the line.

[schlessera]

@santilin Before I do a line-by-line review of the code, can you please push a commit to fix the indentation, it seems to be all over the place. According to WPCS, please use tabs for indentation, and spaces for alignment only.

[santilin]

@santilin Before I do a line-by-line review of the code, can you please push a commit to fix the indentation, it seems to be all over the place. According to WPCS, please use tabs for indentation, and spaces for alignment only.

Done @schlessera

[schlessera]

@santilin Are you still interested in working on this?

[schlessera]

Gentle ping? :D