added avro format, depends on RAVRO

Still problems with class path  and attaching bit64
add avro blurb
add avro mr test
looks like the auto indent feature was a on a roll
small errors
apparently the .avro extension is needed for input format to work

fails at the java level. No input to R if extension missing. Workaround
is good for now so that we know other things are working
option makes sure patched jars are picked up first
back to cdh4 bundled version
restructured for readability in lists. Merge with master will be problematic as the same has happened there already. Keep that version but add the avro entries when the time comes.
revert to using system jars
more expressive message when hitting the Nan or Inf issue fixes #4
rely on env variable to find avro jars
Adding wrapper tools for testing avro files and transitioning avro mapreduce tests to a separate file.
for some reason file: protocol not understood
deal with slightly different format for -Inf
Pass additional arguments through the avro input format to `parse_avro`
Merge branch '2.3.0-avro' of https://github.com/RA-Internal/rmr2 into 2.3.0-avro
Passing additional variables through to ravro:::parse_avro for "avro" input format
Extended avro testing
merge from avro branch

Merge branch '2.3.0-avro' of git://github.com/RA-Internal/rmr2 into RA-Internal-2.3.0-avro

Conflicts:
	pkg/DESCRIPTION
	pkg/R/IO.R
	pkg/man/make.io.format.Rd
	pkg/tests/mapreduce.R