sp-get-string search should fallback to sp-get-stringlike-expression if
inside a comment
sp-get-stringlike-expression should respect comments bound
Rename sp--get-context to sp--get-handler-context
[Issue #358] sp-delete-pair should respect context
[Issue #358] Do not move point in case of unsuccessful deletion
[Issue #307][ruby-mode] Fix backward scaning of pairs claiming to be strings