Test perf for series str (#620)
Test perf for series str (#620)

* parallel and add mask for methods: capitalize, casefold, swapcase, title

* correct master

* add empty line

* add perf tests for Series.str

* delete extension case

IntelLabs/hpat,IntelLabs/hpat,IntelLabs/hpat,IntelLabs/hpat