Condest et al.#12

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CVerhoosel wants to merge 9 commits intonutils:masterfrom

CVerhoosel:master

Commits on Feb 16, 2014

Added not implemented error to ArrayBuilder
CVerhoosel
committed

Commits on Feb 26, 2014

Commits on Feb 27, 2014

Introduced assert_equal operator for reduce
CVerhoosel
committed

Commits on Feb 28, 2014

Commits on Mar 2, 2014