change mimewritable to take instance rather than type
Infer element type for general multi-dimensional getindex
doc fix
Merge pull request #4393 from wlbksy/docfix

doc fix
Merge pull request #4375 from stevengj/mimewritable

RFC: change mimewritable to take instance rather than type
Merge pull request #4387 from simonster/getindex

Infer element type for general multi-dimensional getindex
Added two root mean square (rms) function. One who takes two data series and one who takes the difference between two time series.
Added tests for the rms functions.
Added new rms function to the export list.
Significantly reduced footprint of rms functions by avoiding allocation for temporaries. All thanks to ivarne
Merge branch 'statistics' of https://github.com/cfbaptista/julia into statistics

Conflicts:
	base/statistics.jl
Reduced footprint of rms significantly thanks to ivarne