conv and conv2
added permutedims!

Separated the permutedims method into a permutedims! method which
stores the permutation a given array into a specified destination, and
the wrapper permutedims which reproduces the original functionality by
creating the required destination storage and then calling permutedims!
on it.
Further changes to permutedims and tests

With this commit, all tests pass. I changed the permutedims tests to
have permutations specified by vectors instead of tuples (which is also
how it is stated in the manual). I also had to make two seperate
versions of permutedims!: when B is a BitArray, P has to be a BitArray,
whereas for B a StridedArray, P should be an Array. I don’t think it is
possible to obtain this behavior in a single parametric definition.
FixedSetPartitions

Functionality for iterating over the partitions of a set into a fixed
number of subsets. partitions(array,m) relates to partitions(array)
like partitions(n,m) relates to partitions(n).
fixed typo in description in manual
Replaced tabs with spaces
Removed type annotation of argument in isperm

As requested
add BitsFloat abstract type, leverage dispatch for rounding modes
Project Euler: decent basic functionality tests & fun to write.

This seems like a pretty good way to get better test coverage of
miscellaneous functionality, especially of the mathematical kind.
That's how I discovered digits didn't work for BigInts yesterday:
the test introduced was actually problem 16.
Projet Euler 5: lcm(1:20) == 232792560

It's handy to be able to take the gcd/lcm of a collection of integers.
Also, code golf in your own language feels a bit cheap.
Project Euler 6-11.
gcd, lcm on collection: use reduce instead of splatting.
tests/euler.jl: 13, 14 & 20.
test/euler.jl: 24
Add summary of tools for enhancing performance
Merge branch 'master' of github.com:JuliaLang/julia
Performance tips: add pre-allocation
docs: fix formatting issues with 31c8388aa79366b1591464d5654ea0e3d2c2b518
NEWS updates
Package libuv-julia-dev doesn't exists