Add multiple input file support
adding user specificed important_sub_metrics
Add support for single or multiple regex file name specifications for local files
Remove unnecessary call to os.path.join
Remove redundant check for failure to collect infile
Updated Failure Handling for metric.collect
Catch URLError
Add multiple infile support for sar
Fix GC Parsing on OSX
Merge pull request #195 from SharadGandhi/multiple_file_support

Add multiple input file support
Merge pull request #198 from SharadGandhi/issue-196

bugfix:issue-196 Fix GC Parsing on OSX
merge upstream changes
Merge branch 'master' of github.com:linkedin/naarad into issue111
split
Merge pull request #197 from RiteshMaheshwari/issue111

adding user specified important_sub_metrics
Merge branch 'master' of github.com:linkedin/naarad into issue192
log warn if predefined metric exists