Support testing on Windows (#820)

* fix linter for windows

* enable watch

* improve watch

* Update CONTRIBUTING.md

Author: dplewis

.gitattributes

@@ -0,0 +1,15 @@
+* text=auto eol=lf
+
+*.js text
+*.html text
+*.less text
+*.json text
+*.css text
+*.xml text
+*.md text
+*.txt text
+*.yml text
+*.sql text
+*.sh text
+
+*.png binary

CONTRIBUTING.md

@@ -35,11 +35,12 @@ The Parse JS SDK is built for three platforms:
 - react-native
 
 When developing the SDK you can use `npm run watch` in order to rebuild your changes upon each saves.
-By default, the watch command will rebuild the SDK for the node platform. You can toggle this by setting the environment variable PARSE_BUILD. Valid values are:
 
-- node
-- browser
-- react-native
+By default, the watch command will rebuild the SDK for the browser platform. The following commands will rebuild changes for a specific platform.
+
+- `npm run watch:node`
+- `npm run watch:browser`
+- `npm run watch:react-native`
 
 ### Testing the code