add certificates to db
add index to user and supplier
add coverages with index on foreign keys
add gl and excess limits with index on foreign keys
add suppliers with index on name, vendor_nbr and supplier_nbr
add insurers
add insurers
add twitter boostrap
Merge pull request #1 from kyledaugherty/users

Users
Merge branch 'master' into certificates
Merge pull request #2 from kyledaugherty/certificates

Certificates
Merge branch 'master' into coverages
Merge pull request #3 from kyledaugherty/coverages

Coverages
Merge branch 'master' into suppliers
Merge pull request #4 from kyledaugherty/suppliers

Suppliers
Merge branch 'master' into insurers
Merge pull request #5 from kyledaugherty/insurers

Insurers
fix merge conflicts
Merge pull request #6 from kyledaugherty/styling

Styling
fix merge conflicts