Support nested directories in Spark Streaming
change Nit
support depth
Change space before brace
change process any files created in nested directories
reformat code
add a require(depth >= 0)
reformat code
change performance
change filter name
change line exceeds 100 columns
no braces for case clauses
Performance optimization：directory records have judgment
line over 100
remove line
style
change get depth
Use 'isDir' to modify the compatibility
Merge branch 'branch-1.2-oc' of https://github.com/asiainfo/spark into branch-1.2-oc