update create_salesforce_lead to include corporate_membership_type
reverse back pillow to the latest version
version bump
change to capital case for company_category_c
remove the Company_Category_c field
replace django-simple-captcha with django-simple-math-captcha

The django-simple-captcha is having an issue of cutting off images at bottom, but the latest version requires the latest pip which would introduce a lot of hassles. Hence the replacement.
version bump
add field Company_Category__c to salesforce lead object
version bump
Merge branch 'master' into bixly-testing