[gulp, travis, protractor, e2e] e2e tests now should be skipped on travis if selenium doesn't start in time
[build] ng-annotate is not run on build/components directory
[front-end] change template images
[front-end] make 2 columns alignment and show error messages
[front-end] add style for error message and for chosen template
[front-end] show error messages in tenew page addition moda; resolve #82
Merge branch 'iss82-new-pages-addition' into develop
[front-end] highlight chosen widget and show an error message when no widget is chosen and there is an attempt to add a new one
[front-end] stretch a widget image to fill all available space
[front-end] show error messages and highlight chosen widget; resolves #65