Update release notes for 1.15
Update release notes for 1.15
Merge branch 'wm-notes-1.15.0' of https://github.com/rethinkdb/rethinkdb into wm-notes-1.15.0

Conflicts:
	NOTES.md
Add missing PR
Add a few newly-closed issues
Fix version number
Backtrace should prefix geo terms
Fix errant edit
Reset extra_row - Related to #3037
Let codemirror properly handle events when the query is too big - #3043
Updates based on comments
More updates, two new issues
merge of #2962 MacOS build not statically linking libidn and libz
Accept composite values for $CXX (such as 'distcc clang')

Review 2095 by @larkost
Use actual name for `eq_join`

This term is named `eq_join`, not `inner_join`.
Merge branch 'gchpaco_2185' into v1.15.x

Fixes #2185 for next.  In CR 2083.
Merge branch 'gchpaco_3057' into v1.15.x

This fixes #3057, which was in CR 2107.
Fix instances of 'const datum_string_t &x = y.as_str()' where y is a temporary value.
Change release name
fixing a cpplint found warning

over-the-shoulder review by @Tryneus