Added ipo model.
Started working on the parser.  It is not done yet.
Convert IPO#valuation_amount to a bigint
Import IPOs
Serialize IPOs
finished testing ipo model, serializer, created factory, modified and tested parser
Use Rails try to handle nil value
Add founded_on to the schema.
Condense #usd_valuation to single line
Fix misspelling valuation_amount
Fix CompaniesController spec

Needed IPO json data
Merge pull request #60 from cloudspace/64830482_ipo

64830482 ipo
indexed company name and permalink, removed company name requirement validation, made date_converter more fault tolerant
Merge pull request #61 from cloudspace/65130176_misc_small_fixes

indexed company name and permalink, removed company name requirement val...
added state_code to company serializer, added tests
Merge pull request #64 from cloudspace/65150284_state_code

added state_code to company serializer, added tests
Remove unnecessary hashes in FactoryGirl Factories
Add a :valid_company Factory
Refactor CategoriesController spec
Use :valid_company factory where appropriate