Fix for issue #77 (#91)

Fix #77 - Change COHERENCE_GRPC_PROXY_ADDRESS env to match Python and Golang

Author: rlubke

README.md

@@ -127,7 +127,7 @@ let session = new Session(opts)
 ```
 
 It's also possible to control the default address the session will bind to by providing
-an address via the `COHERENCE_GRPC_PROXY_ADDRESS` environment variable.  The format of the value would
+an address via the `COHERENCE_SERVER_ADDRESS` environment variable.  The format of the value would
 be the same as if you configured it programmatically as the above example shows.
 
 Once the session has been constructed, it will now be possible to create maps and caches.

src/session.ts

@@ -260,9 +260,16 @@ export class Options {
    * Construct a new {@link Options}.
    */
   constructor () {
-    this._address = (process.env.grpc_proxy_address || process.env.COHERENCE_GRPC_PROXY_ADDRESS)
+    this._address = (process.env.grpc_proxy_address ||
+                     process.env.COHERENCE_GRPC_PROXY_ADDRESS ||
+                     process.env.COHERENCE_SERVER_ADDRESS)
         || Session.DEFAULT_ADDRESS
 
+    if (process.env.COHERENCE_GRPC_PROXY_ADDRESS !== undefined) {
+      console.warn("The COHERENCE_GRPC_PROXY_ADDRESS environment variable"
+                   + " is deprecated. Please use COHERENCE_SERVER_ADDRESS instead.")
+    }
+
     this._requestTimeoutInMillis = Session.DEFAULT_REQUEST_TIMEOUT
     this._readyTimeoutInMillis = Session.DEFAULT_READY_TIMEOUT
     this._format = Session.DEFAULT_FORMAT