Merge pull request #1 from RstProd/master

Class enumerable
Merge pull request #2 from RstProd/master

foldr,foldl
Merge pull request #3 from RstProd/master

return
Added possibility to create infinitive and decreasing sequences.
For example: [1..], [1,-2..-10], [2,-5..]
Some tests for sequences
Some fixes in test
test fix
Code cleanup
Merge pull request #1 from agsh/master

test pull