Auto deploy Noms JS SDK (#1208)

This computes a new version based on the number of changes to the
js directory.

This does not yet actually publish the new version. I need to see how
Travis behaves before I can do that.

Towards #1200

.travis.yml

@@ -53,3 +53,8 @@ cache:
   - clients/pitchmap/ui/node_modules
   - clients/splore/node_modules
   - nomdl/codegen/test/node_modules
+deploy:
+  provider: script
+  script: tools/publish-js-sdk.py
+  on:
+    branch: master

tools/publish-js-sdk.py

@@ -0,0 +1,20 @@
+#!/usr/bin/python
+
+import os, subprocess
+
+def main():
+  os.chdir('js')
+  print os.getcwd()
+  current_deployed_version = subprocess.check_output(['npm', 'info', '@attic/noms', 'version'])
+  current_deployed_major_version = current_deployed_version.split('.')[0]
+  log = subprocess.check_output(['git', 'log', '--oneline', '--', '.'])
+  new_major_version = len(log.splitlines())
+  print 'Old version: %s, New version: %s', (current_deployed_version, new_major_version)
+  if int(new_major_version) > int(current_deployed_major_version):
+      subprocess.check_call(['npm', 'version', '%s.0.0' % new_major_version])
+      # subprocess.check_call(['npm', 'publish'])
+      subprocess.check_call(['npm', 'whomai'])
+      print 'Not pushing this time. Maybe next time?'
+
+if __name__ == '__main__':
+  main()