Update nek5000 example scripts (#241)

* Update nek5000 examples to use NEKTOOLS_DIR

* Remove +x

* Nek: Fix a bug in generate-boxes.sh script

* Use one script for nek exaamples

* Update m

Update nek5000 example scripts (#241)

* Update nek5000 examples to use NEKTOOLS_DIR

* Remove +x

* Nek: Fix a bug in generate-boxes.sh script

* Use one script for nek exaamples

* Update make-nek-tests.sh

* Update nek-examples.sh

* Change permissions of make-nek-tests.sh

* Update examples Makefile to use new nek script

* Update nek5000 examples build process

* Trying to make travis happy

* Polishing the script

* This should make Travis happy

* Polish nek-examples.sh

* Update examples/Makefile

* Update top-level makefile

* Delete make-nek-tests.sh & update nek-examples.sh

* Update Makefile and examples/Makefile

* Update nek-examples.sh

* Update TESTARGS in bp .usr files

* Update Makefile

* Update .travis.yml

* Update nek-examples.sh

* Add CEED_DIR to tap.sh

* Uncomment OCCA_DIR in Makefile

* Fix make prove and update tap.sh

* Pass NEK5K_DIR and CEED_DIR in prove-all

* Set MPI=0 default for Nek examples/tests

* Nek5K make updates

* Make prove update

* Update make-prove to make all ex except Nek5K in parallel

* Set Nek5K examples to use MPI by default

* Makefile: Improved Nek5k handling

* Makefile: build Nek bps in separate directories

* Nek: rename dir for f77 file length

* debugging

* Nek: use single source

* Makefile: fix Nek mpif.h issue

* Nek: Clean up build proces, improve documentation

* Makefile: enable building single Nek example in parallel with other examples

* Nek: Fix CC/FC and TESTARGS

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