fix NPE thrown on getAll requests with single key
Incorporating code review comments for changes in R2Store
Move to tusk-0.0.2 version
Update build.properties and release_notes for version 1.6.9
Adding BDB5 instructions
Refactor schema backward compatibility check

1. Fix a bug that will leave a store created even when exception has been thrown
2. Consolidate strings used by tests
3. Consolidate backward compatiblity check into StoreDefinitionUtils
Changed setReadOnly(true) -> setReadOnly(false) to prevent writing file summary fail when during bdb conversion
Merge pull request #169 from jameswu0629/bdb-conversion-0.9x-1.6.x

Changed setReadOnly(true) -> setReadOnly(false) to prevent writing file summary fail when during bdb5 conversion
Updating .classpath with new tusk jar
Adding checks to validate Avro schema during add-store
Replace keySet() with entrySet() in validateAllAvroSchemas
Log failure stats when node goes unavailable
Log the number of failures, percentage when the node goes unavailable
Include whitespace before loop constructs

Currently the eclipse will use
for(condition)

After this the eclipse will do
for (condition)

notice the space between for and start of the open braces

similarly for case, if, while, synchronized and try blocks.
Merge remote-tracking branch 'origin/master'