Rename RippleAPI client to Client (#1520)

* rename RippleAPI -> XrplClient

* more renames

* move API stuff to client folder

* rename all api -> client

* fix tests

* make tests run

* fix integ tests

* fix urls

* fix merge issues

* XrplClient -> Client

* fix merge issues

* rename xrpl-client npm symlink to xrpl-local

test/client/deriveKeypair/index.ts

@@ -0,0 +1,39 @@
+import assert from 'assert-diff'
+import {TestSuite} from '../../utils'
+
+/**
+ * Every test suite exports their tests in the default object.
+ * - Check out the "TestSuite" type for documentation on the interface.
+ * - Check out "test/client/index.ts" for more information about the test runner.
+ */
+export default <TestSuite>{
+  'returns keypair for secret': async (client, address) => {
+    var keypair = client.deriveKeypair('snsakdSrZSLkYpCXxfRkS4Sh96PMK')
+    assert.equal(
+      keypair.privateKey,
+      '008850736302221AFD59FF9CA1A29D4975F491D726249302EE48A3078A8934D335'
+    )
+    assert.equal(
+      keypair.publicKey,
+      '035332FBA71D705BD5D97014A833BE2BBB25BEFCD3506198E14AFEA241B98C2D06'
+    )
+  },
+
+  'returns keypair for ed25519 secret': async (client, address) => {
+    var keypair = client.deriveKeypair('sEdV9eHWbibBnTj7b1H5kHfPfv7gudx')
+    assert.equal(
+      keypair.privateKey,
+      'ED5C2EF6C2E3200DFA6B72F47935C7F64D35453646EA34919192538F458C7BC30F'
+    )
+    assert.equal(
+      keypair.publicKey,
+      'ED0805EC4E728DB87C0CA6C420751F296C57A5F42D02E9E6150CE60694A44593E5'
+    )
+  },
+
+  'throws with an invalid secret': async (client, address) => {
+    assert.throws(() => {
+      client.deriveKeypair('...')
+    }, /^Error: Non-base58 character$/)
+  }
+}