Switch to Maven for build

[lintool]

Switch from Ant/Ivy for build and package management.

[cigrainger]

I get a compilation error and build failure now with Maven saying:

[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] Failure executing javac, but could not parse the error:
javac: directory not found: /home/hadoop/Mr.LDA/target/classes
Usage: javac
use -help for a list of possible options

[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.720 s
[INFO] Finished at: 2014-07-02T21:29:34+00:00
[INFO] Final Memory: 13M/208M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project mrlda: Compilation failure
[ERROR] Failure executing javac, but could not parse the error:
[ERROR] javac: directory not found: /home/hadoop/Mr.LDA/target/classes