Changed cliff version to remove pyparsing package conflict

<pre>
Installed /home/rranjan/.virtualenvs/raxcli/lib/python2.7/site-packages/raxcli-0.0.1-py2.7.egg
Processing dependencies for raxcli==0.0.1
Searching for pyparsing==1.5.7
Reading https://pypi.python.org/simple/pyparsing/
Reading http://pyparsing.sourceforge.net/
Reading http://pyparsing.wikispaces.com/
Reading http://sourceforge.net/project/showfiles.php?group_id=97203
Reading http://sourceforge.net/projects/pyparsing
Best match: pyparsing 1.5.7
Downloading https://pypi.python.org/packages/source/p/pyparsing/pyparsing-1.5.7.zip#md5=b86854857a368d6ccb4d5b6e76d0637f
Processing pyparsing-1.5.7.zip
Writing /tmp/easy_install-Fufim_/pyparsing-1.5.7/setup.cfg
Running pyparsing-1.5.7/setup.py -q bdist_egg --dist-dir /tmp/easy_install-Fufim_/pyparsing-1.5.7/egg-dist-tmp-mFT8WB
zip_safe flag not set; analyzing archive contents...
pyparsing: module MAY be using inspect.stack
Adding pyparsing 1.5.7 to easy-install.pth file
 
Installed /home/rranjan/.virtualenvs/raxcli/lib/python2.7/site-packages/pyparsing-1.5.7-py2.7.egg
error: Installed distribution pyparsing 1.5.7 conflicts with requirement pyparsing>=2.0.1
</pre>

Full trace-back can be found here https://gist.github.com/rahulrrixe/9399624