[Docs] remove dependencies for building docs

Remove depencendies necessary to build docs from package.json and
specify them in the readme.  Due to difficulty managing dependencies
for nomnoml on different platforms, this reduces dependency requirements
to only those needed for building the package.

README.md

@@ -99,17 +99,16 @@ Run as `mvn clean install`.
 ### Building Documentation
 
 Open MCT Web's documentation is generated by an
-[npm](https://www.npmjs.com/)-based build:
+[npm](https://www.npmjs.com/)-based build.  It has additional dependencies that
+may not be available on every platform and thus is not covered in the standard
+npm install.  Ensure your system has [libcairo](http://cairographics.org/)
+installed and then run the following commands:
 
-* `npm install` _(only needs to run once)_
+* `npm install`
+* `npm install nomnoml`
 * `npm run docs`
 
-Documentation will be generated in `target/docs`. Note that diagram
-generation is dependent on having [Cairo](http://cairographics.org/download/)
-installed; see
-[node-canvas](https://github.com/Automattic/node-canvas#installation)'s
-documentation for help with installation.
-
+Documentation will be generated in `target/docs`.
 
 # Glossary
 

circle.yml

@@ -2,6 +2,7 @@ deployment:
   production:
     branch: master
     commands:
+      - npm install nomnoml
       - ./build-docs.sh
       - git push git@heroku.com:openmctweb-demo.git $CIRCLE_SHA1:refs/heads/master
   openmctweb-staging-un:

package.json

@@ -7,7 +7,6 @@
     "minimist": "^1.1.1"
   },
   "devDependencies": {
-    "canvas": "^1.2.7",
     "glob": ">= 3.0.0",
     "jasmine-core": "^2.3.0",
     "jsdoc": "^3.3.2",
@@ -24,7 +23,6 @@
     "markdown-toc": "^0.11.7",
     "marked": "^0.3.5",
     "mkdirp": "^0.5.1",
-    "nomnoml": "^0.0.3",
     "requirejs": "^2.1.17",
     "split": "^1.0.0"
   },