Commandline build

Added a command-line ant build for the "SignalA", "SignalA.LongPolling" and "parallel-basic-http-client" modules.

Custom rules added to the "SignalA.LongPolling" build to gather "classes.jar" files from each of the dependent module builds into a ```dist/``` folder with appropriate names.

Added IntelliJ IDEA project files to the ```.gitignore``` file.

Note: a comment had to be deleted from "HubProxy.java" as it broke the ant build, due to unrecognizable (non-UTF-8) character in the comment on line 93.