fix documentation of String module
fix spec and add more test for String.duplicate/2
Merge pull request #2861 from jw2013/string

Improve String module
Improve documentation of Dict module
Merge pull request #2865 from jw2013/dict

Improve documentation of Dict module
fix inline documentation because of broken ansi representation in iex
Merge pull request #2866 from tonini/clean-inline-doc

fix inline documentation because of broken ansi representation in iex
fix typo
Merge pull request #2868 from jw2013/integer-typo

fix typo
fix wrong String.split_at/2 output when second arg is not an integer
Merge pull request #2875 from jw2013/string

fix wrong String.split_at/2 output when second arg is not an integer
fix wrong String.at/2 output when second arg is not an integer
Merge pull request #2877 from jw2013/string

fix wrong String.at/2 output when second arg is not an integer
explains when to use Float.parse/1 and that String.to_float will not deal with integer fmt strings
bypass warning
fix mistake on test
fix doc line's length and test one more time
Merge pull request #2873 from eksperimental/float

improve and examples for Float.parse/1 and String.to_float
Fix SupervisorTest :push handle_cast method

* handle_cast/2 does not take 'from' param
Merge pull request #2878 from akira/supervisor_test_fix

Fix SupervisorTest :push handle_cast method