Accept share input size in bytes, KB, MB and GB

add dropdown to accept the different size scales
implement the logic which converts user entered share size into bytes
Implement hack for djangorecipe relative-path problem

This only effects prod/rpm based installs. bin/django, which is required for db
migrations doesn't get generated with relative paths. As a workaround stage
bin/django and copy during rpm post install.
Merge pull request #45 from schakrava/issue#44_django_relative-path_hack

Implement hack for djangorecipe relative-path problem
Remove Bytes from share input size dropdown.
Add TB in dropdown and change size scales to KB,MB,GB,TB.
Merge pull request #43 from Mchakravartula/issue#19_share_input_size

Accept share input size in bytes, KB, MB and GB