[#164] Make to_s in paginator threadsafe

Make explicit what the paginator to_s is doing
In a high-load environment, may not
repress logging consistently as desired
Fix Missing partial Error when 'paginate' called from different format template
Run CI against rbx-19mode
Merge pull request #385 from jc00ke/master

Test against rbx
Restore tests for sinatra, fixes #387
Find a proper version of padrino-helpers
Merge pull request #374 from bf4/164-threadsafe-paginator

[#164] Make to_s in paginator threadsafe
Merge pull request #388 from udzura/sinatra-rework

Fix tests for sinatra
Merge pull request #381 from joker1007/fix_called_from_different_format_template

Fix Missing partial Error when 'paginate' called from different format template
Ask if defined? against the instance. And don't open it if doing nothing
Merge remote-tracking branch 'upstream/master'
data attribute for page
merged master