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 #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
remove default comments created by rails
add resources for users and sessions
add google's shim for < IE 9
add user sign in and account settings to nav bar
add sessions controller and helpers and sign in page