Drop meaningless, outdated, inconsistent version tags in doc blocks.

find phpseclib -type f -name "*.php" -exec sed -i '/@version/d' {} \;
Merge pull request #288 from bantu/drop-meaningless-version-tags

Drop version tags from doc blocks.

* bantu/drop-meaningless-version-tags:
  Drop meaningless, outdated, inconsistent version tags in doc blocks.