Import materialize from ArrayLayouts

[jishnub]

Since materialize in ArrayLayouts acts on Mul instances and not Broadcast objects, these need not be the same function. That they are identical currently is an implementation detail, and it's best to not rely on this. This PR imports these from ArrayLayouts instead.

Also, this PR removes certain unused imported macros, and the Base module which doesn't need to be explicitly imported.

[codecov]

Codecov Report

Merging #271 (f4a621d) into master (7009bd1) will increase coverage by 0.19%.
Report is 5 commits behind head on master.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #271      +/-   ##
==========================================
+ Coverage   93.55%   93.75%   +0.19%     
==========================================
  Files          14       14              
  Lines        2374     2401      +27     
==========================================
+ Hits         2221     2251      +30     
+ Misses        153      150       -3     

Files Changed	Coverage Δ
src/LazyArrays.jl	100.00% <ø> (ø)

... and 8 files with indirect coverage changes

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