PARQUET-92: Pig parallel control

The parallelism for reading footers was fixed at '5', which isn't optimal for using pig with S3.  Just adding a property to adjust the parallelism.

JIRA: https://issues.apache.org/jira/browse/PARQUET-92

Author: Daniel Weeks <dweeks@netflix.com>

Closes #57 from dcw-netflix/pig-parallel-control and squashes the following commits:

e49087c [Daniel Weeks] Update ParquetFileReader.java
ec4f8ca [Daniel Weeks] Added configurable control of parallelism
d37a6de [Daniel Weeks] Resetting pom to main
0c1572e [Daniel Weeks] Merge remote-tracking branch 'upstream/master'
98c6607 [Daniel Weeks] Merge remote-tracking branch 'upstream/master'
96ba602 [Daniel Weeks] Disabled projects that don't compile