website: Add diagram to controls page.

Update scripts for deploying website.

wobsite/.gitignore

@@ -113,4 +113,5 @@ crashlytics-build.properties
 .bundle
 vendor
 
-Gemfile.lock
\ No newline at end of file
+Gemfile.lock
+PASSWORD
\ No newline at end of file

wobsite/_config.yml

@@ -53,4 +53,5 @@ exclude:
     - Makefile
     - README.md
     - LICENSE
-    - deploy
\ No newline at end of file
+    - deploy
+    - PASSWORD
\ No newline at end of file

wobsite/controls.md

@@ -20,6 +20,6 @@ The model we are developing follows the methods developed by our advising
 graduate student Matt Rich in his thesis [Model development, system
 identification, and control of a quadrotor helicopter][1].
 
-
+<img src="images/pid_diagram.png" width="700">
 
 [1]: http://lib.dr.iastate.edu/etd/12770/
\ No newline at end of file

wobsite/deploy

@@ -2,7 +2,11 @@
 
 HOST=may1716.sd.ece.iastate.edu
 USERNAME=may1716
-PASSWORD=6peprikt
+[ -e PASSWORD ] || echo "ERROR: File PASSWORD is missing.
+Create a file called PASSWORD, and put the sftp password in that file.
+No spaces. No newlines."
+[ -e PASSWORD ] || exit 1
+PASSWORD=$(cat PASSWORD)
 
 cd _site || exit 1
 
@@ -13,3 +17,5 @@ cd www
 mirror -R
 exit
 END_SCRIPT
+
+echo "Website updated."
\ No newline at end of file