compile fix.
merge.
Merged ytkyaw/ydn-db into master
Quote column names in websql queries

Some part of the websql was missing column name quoting.
Column name was quoted two times
Merged in mrande/ydn-db/fix-websql-quote (pull request #9)

Quote column names in websql queries
assertion
interim support for table schema change.
fixing composite query in websql.
fixing array keyPath
experimenting with Object.freeze. compile OK.
test passed.
array keyPath fix.
array keyPath fix.