Sbt Integration
Update tot 0.13.6

Https updates and because Name hashing Incremental compilation turned
on by default.
lazy evaluation! actions that have mayExport = false will be put into buffer and executed later.
allow pages to be cached into DFS and loaded later to reduce network dependency
autoSave and autoCache both enabled by default. their default path pattern is:
root/backtrace_generated_dir/blockKey/timestamp.
ClientAction named back to action as package is enough to distinguish.
Container renamed to Block
All time parameter type change to Duration to allow more flexible definition
Page now have blockKey as part of UID to handle multiple page exported from a block action.
Everything in backtrace now extends Product to ensure they are case classes
Lookup is defined as a function from PageUID to path.
Minor refactoring for simplicity
some code clean up
DelayForDocumentReady now becomes an object
PageRowRDD.visit and .wget now cleans all actions
remove unnecessary broadcast
make Weibo example deeper.
SpookyTestCore now printout results in tsv format
change an acceptance test
add boilerpipe support.
version number upgrade to 0.2.0_SNAPSHOT
assembly jar location change to .../scala-${scala.version}/...
Merge pull request #10 from techaddict/sbt_integration

Sbt Integration, thanks techaddict!
oops I screw up, should use scala.binary.version in assembly jar path
upgrade version in bash & sbt to 0.2.0-SNAPSHOT
fix a bug in integration test display
fix a typo in bash, change all acceptance test to use noInput
see how far one has to go to preserve his/her order of columns! PageRowRDDFunctions has been renamed PageSchemaRDD, with most functions returning self type and column names are stored in a separate ListSet on driver