Add info about template for Checkbox problem type

Change text to "click Checkboxes on the Common Problem Types tab" and
add image of checkbox button
Correct minor formatting error
Add JSInput template information

Update Advanced Problems page with Custom JavaScript Display and
Grading (JS Input) problem info. Delete separate page for JS Input
problems. Update Appendix F with new code for sample JS Input problem.
Update JS Input to reflect new template in Studio

Update Advanced Problems file and Appendix F
Hide staticpages preview on render
STUD-1071
update rewriteStaticLinks utility function(modifiy only relative urls)
STUD-674
fix tinymce popup size too small
STUD-674
add validation for grading types (allow only integers)
STUD-988
Merge pull request #2044 from zubair-arbi/zub/bugfix/std674-inserteditlink

update rewriteStaticLinks utility function(modifiy only relative urls) +...
Merge pull request #2048 from zubair-arbi/zub/bugfix/std1071-staticpagespreview

Hide staticpages preview on render
Merge pull request #2052 from zubair-arbi/zub/bugfix/std988-integergradingtypes

add validation for grading types (allow only integers)
The function tzAbbr() causes null-reference exception when the browse returns a non-English timezone string.
Add 'Yihua Lou <supermouselyh@hotmail.com>' to the AUTHORS file.
Merge pull request #2060 from edx/louyihua/tzAbbr

Fix tzAbbr() in non-English browsers #os
Very Minor tweaks to the LMS and CMS startup.

I was going to do something in the startup code, then changed my mind,
but didn't want to just discard these changes.
Merge pull request #2069 from edx/ned/minor-startup-fixes

Very Minor tweaks to the LMS and CMS startup.
Add options to dump_course_structure to output inherited metadata.
Add tests for inherited metadata to test_dump_course, and move to commands/tests dir.
prevent failure when module does not have a data field
Merge pull request #1682 from mulby/gabe/fix-get-items-without-data

prevent failure when module does not have a data field