EXP-46. (P2) Allow express script to launch schema-shell.

This commit modifies the express script to launch kiji-schema-shell
with express modules preloaded.

Reviewed by: robertchu
EXP-65. Validate key-value store properties when validating model environment.

This commit removes key-value store properties checks from the
ExtractScoreProducer, and adds them to the key-value store validation
performed in ModelEnvironment.

Reviewed by: robertchu
Initial work on writing to map-type CFs.

Splits ColumnFamily into ColumnFamilyInput and ColumnFamilyOutput.
Compiles; old tests pass.
no new tests yet.
Starting to write tests.
Wrote a KijiSourceSuite test
Wrote a KijiSourceSuite test
Changed it to re-merge ColumnFamily
local test passes, hadoop test doesn't.
add the 'finish' call to the job test
Test correctly serializes and runs
blah
cleanup that breaks shit
fixed
cleaned up diff
after robert's review 1
Tests pass