Publish v0.11.4 to Maven Central

[tvasenin]

At the moment, the latest version published to Maven Central is v0.10.1:
https://mvnrepository.com/artifact/net.sourceforge.parallelcolt/parallelcolt

v0.11.4 contains an important fix for #6.

@rwl @amalagaura @thorstenwagner, could you pls also address the remaining 'duplicate class' issues reported in
#6 (comment) ?