gitignore the `npm install` directories
cf. commit SHA-1: 4fa76bed610bdcf425d62c3064e4bf8cfba6f26d

- fixed ant build script for windows
cf. commit SHA-1: 4fa76bed610bdcf425d62c3064e4bf8cfba6f26d

- added 'doc' target to regenerate the documentation indexes using `node docs/generate.js`
fixed docs generator (the PHP code produced by the generator crashes on my server; using these relative paths works, at least for me...)
Merge pull request #447 from GerHobbelt/patch-ant-build-script1

Patch ant build script for Windows boxes