Migrated isapprox() to base
Added test suite for isapprox()
Documentation for isapprox()
Removed duplicate definitions of rtoldefault and atoldefault methods
Test and export hooks for isapprox
faster readcsv. fixes #3350
Simplified implementation for real nonfloats as well as for complex numbers
Updated documentation for isapprox()
small amount of cleanup in multi.jl
update plife example
Merge branch 'master' of github.com:JuliaLang/julia
Fix SubString{UTF8}

* case which led to endof < 0
* out-of-bounds case
Fix replace for UTF8 strings
Fix redirection deprecation warnings
Use `|>` for function piping instead of `|`
fix trivial README confusion
remove some dead code in stream.jl
improve iobuffer truncate not to store more 0s than necessary
replace memio with IOBuffer
Merge branch 'master' of github.com:JuliaLang/julia
syntax error for non-unique arguments and/or static parameters
fixes #3432