Some Execution fixes
autoload file with user's own custom commands
add 'Config.defaultFrom(mode)', use for replConfig
add test for whether hadoop.tmp.dir is used
Force JobConf to evaluate values in Config.fromHadoop (fixes #1014)
make ReplTest actually run in Hadoop mode again and now just match against the evaluated tmp dir
search up from current directory for '.scalding_repl' files to source
add test to verify that '.scalding_repl' is being loaded
pipe directly into $SCALD_REPL
refactor InputSizeReducerEstimator to correctly unroll multisourcetaps and improve reporting
fix prettyprint and scalariform
customizable prompt
absolutely superfluous coloring of Scalding splash
Merge pull request #1017 from bholt/bholt/unroll-taps-refactor

Refactor InputSizeReducerEstimator to correctly unroll MultiSourceTaps
explain mysterious '.scalding_repl' file
well that explains why hRaven estimates were backwards
Merge pull request #1007 from twitter/execution-fixes

Some Execution fixes
Merge pull request #1016 from morazow/update/cascading-jdbc

Update Cascading JDBC Version.
Merge pull request #1018 from twitter/bholt/oops

Fix hRaven Reducer Estimator
rename 'replConfig' and make it a var, also comment on 'Config.fromHadoop'