Merge pull request #208 from ripple/tests

Add database test
[TASK] rename fee endpoint to `/transaction-fee`
[TEST] rename `fee` to `max_fee`

where we're setting `max_fee`
[TASK] add `max_transaction_fee` to config

so a user can configure the `max_transaction_fee` on a remote, how much they're willing to pay in fees per transaction
Merge pull request #209 from geertweening/config_max_fee

[TASK] add `max_fee` to config
[TASK] bump ripple-lib to 0.9.3-rc3
Merge pull request #204 from geertweening/rename_fee_endpoint

[TASK] rename fee endpoint to `/transaction-fee`
[TEST] add tests for source currencies query parameter for path find route
Merge pull request #210 from boxbag/pathfind-source-currencies-test

[TEST] add tests for source currencies query parameter for path find route
[TASK] normalize fees to XRP
Merge pull request #211 from geertweening/task/normalize_fee_xrp

[TASK] normalize fees to XRP
[DOC] update release notes
[TASK] bump version to 1.3.1-rc1
[TASK] bump ripple-lib to 0.9.3
[TASK] update npm-shrinkwrap.json

lock dependencies
[DOC] update README
[TASK] bump version to 1.3.1
[DOC] remove irrelevant doc for the github
Fix _line/_trustline parameter discrepancy
Use account_trustline_frozen rather than account_froze_trustline