test/helpers: changed diff_is_negligible() to make it easier to insert a debug print
test/helpers: added support for strided arrays in get_test_array()
First semi-working variant

test_core tests pass.
The code is ugly though, and documentation needs to be updated.
transpose: adjusted to new interface

Unfortunately, combined load/store requires parametrized modules.
Merge branch 'develop' into feature/core-api-change

Merging parametrized modules which are needed for effective axes load/store
core/transformation: added load/store_combined_idx to ArrayArgument objects
transpose: fixed some typos

Tests with combined indices seem to pass.
core: moved Computation/TransformationParameter classes from Signature
TODO: updated tasks for 0.3
Renamed ArgType to just Type
Updating documentation
Fixed incorrect links in docs, added more docstrings
TODO: added a task
cluda/tempalloc: fixed update_buffer() according to changed Array attributes in PyOpenCL

In addition, fixed optional dependencies in setup.py.
Merge branch 'develop' into feature/core-api-change
TODO: updated tasks
TODO: added a task
Renamed Elementwise to PureParallel and updated to new core API
core: using short name for links to Type
TODO: added tasks