Add two step verification to delete database. Related to #707
Fix margins + Switch alert to non error
Fix message in case the name doesn't match
updated term_walker and changed to a switch statement to catch future omissions (c.f. Issue 749)
expanded switch statements
fix a lazy crashing bug (c.f. Issue #757)
Merge branch '749_update_term_walker' into next
fixed merge bug
Merge branch 'next' into sam_libcxx
Merge branch 'sam_libcxx' into sam_libcxx_DiskConflictTest
Merge branch 'michel_707_delete_database' into next
Merge branch 'next' of github.com:rethinkdb/rethinkdb into next
Merge branch 'next' into sam_no_ptr_bag

Conflicts:
	src/rdb_protocol/env.cc
Merge branch 'next' of github.com:rethinkdb/rethinkdb into next
Merge branch 'next' into sam_no_ptr_bag
Merge branch 'next' into sam_etc_deheaderize

Conflicts:
	src/rdb_protocol/term_walker.hpp