removed the discount value bug

check error handling if the discount value is not an integer
Merge pull request #4479 from edx/muhhshoaib/Ex-40-Coupon-discount-value-add-validation

Fixed the  discount value bug
Update link to Jasmine documentation
Fix small i18n typos
Merge pull request #4511 from edx/sarina/fix-i18n

Fix small i18n typos
Adds sample student communications (email msgs)
Merge pull request #4400 from edx/ahodges/documentation/DOC591

Adds sample student communications (email msgs)
Add myself to AUTHORS.
Merge pull request #4521 from edx/jeskew/update_authors

Jeskew/update authors
Getting draft split_test_module instances to import/export.

STUD-327
Added text about grade ranges and certificates
Merge pull request #4529 from edx/markhoeber-documentation-doc420

Added text about grade ranges and certificates
Merge pull request #4491 from edx/christina/export-split

Getting draft split_test_module instances to import/export.
Release notes for 7-23-2014
Merge pull request #4531 from edx/sylvia/docs/relnotes_7_23

Release notes for 7-23-2014
Make overriding branch settings thread-safe LMS-11125
Merge pull request #4494 from edx/nimisha/request-cache-for-branch-settings

Make overriding branch settings thread-safe LMS-11125
Split branch settings LMS-11056
Bugfix: Initialize new tabname to "Empty"

In Studio, when the course administrator creates a new tab, its name was being
initialized as null in the mongo database. This caused students in LMS to get a
server error when trying to access the course page, since LMS was trying to
process the null tabname for translation, etc. Now tabname is initialized as
'Empty', which is how it was being done in the frontend.

STUD-2000
Split branch settings code review fixes LMS-11056