Fix string rendering (issue #9)

All strings that contain characters outside of the "network character"
set are quoted.

Backslashes and double quotes are escaped for strings inside quotations.
Merge branch '1.1.x'

Conflicts:
	src/main/java/org/codeswarm/orafile/OrafileRenderer.java
	src/test/resources/org/codeswarm/orafile/render-test.ora