fixed install_generator timestamp issue
changed routes.rb back from engine to application
renamed lib/assets/stylesheets/surveyor-gui to surveyor_gui and surveyor-gui.sass
moved application.js and application.css to generator templates
Moved surveyor_gui_all.css and surveyor_gui.js to templates

	surveyor_gui_all.css: moved from app/assets to templates/app/assets
	surveyor_gui.js: same
	application.js: deleted from templates
Moved templates/assets to templates/app/assets
Switch models to mirror Surveyor approach to plugin

	lib/surveyor_gui/models/survey_methods.rb: add this file to
	monkey patch survey_methods in surveyor.  See if it gets
	picked up.

	engine.rb: adds some commented out code for an alternative approach,
	forcing the engine to load app/models.  Unclear if this would
	work consistently.
Moved model functionality to lib/surveyor_gui/models *_methods.rb

Extending the Surveyor models by extending the model_methods rather than
the models directly.

	app/models/*.rb: deleted
	lib/surveyor_gui/models: added equivalent {model name}_methods.rb files
	engine.rb: explicitly require_dependency for each model_method