Remove parenthesis from acceptance tests shell command

Remove parethesis in order to get the test to run when system
default /bin/sh is bash since ruby uses /bin/sh to run commands
and using those double parenthesis generates syntax error on bash.
Merge pull request #52 from athos-ribeiro/run-features-with-bash

Merged. Thanks!
[partial] html_filter
filter_html_report for verbose mode
[partial]: refectoring acually process
Adding method feed of Clang Static Analyzer extractor