Made java bindings work in OSX

OS X based machines ship with a case-insensitve file system.
Swig generates two java source files hyperclient.java (specified
by the %module directive) and HyperClient.java which is the publicly
visible java client object. I simply renamed the internal one to
avoid the conflict.

Signed-off-by: Nick Tolomiczenko <nick.tolomiczenko@gmail.com>