Fix warning when running make on freshly cloned repo

When running `make all` I got `ls: tests/: No such file or directory`.
Test (actually compile...) on Travis with R15B03-1 and R16B03-1 too

Do not test OTP 17 because the velvet dep does not support it.
Make updates to key generators and example config files:

* Change most example config files to use partitioned_sequential_int
  instead of sequential_int.  The latter is usually not what people
  want: each load generator uses the same overlapping set of sequential
  integers.  Especially for data setup/prepopulation use, you really
  want each concurrent worker to operate in keys unique from all of
  the other worker, i.e., GO FAST and do not repeat the work that some
  other worker has already done.

* Remove the deprecated int_to_bin generator.  Everyone should be using
  int_to_bin_bigendian or int_to_big_littleendian now.

* Add {int_to_bin_bigendian, Bits} and {int_to_bin_littleendian, Bits}
  generators, to avoid the otherwise-hard-coded limitation of 32 bits
  worth of output.

* Add the {crypto_hash, Type} generator.  Valid types are:
       Type == md4; Type == md5; Type == ripemd160; Type == sha; Type == sha224;
       Type == sha256; Type == sha384; Type == sha512 ->

* Bump the version number to 0.9 in the OTP app file.
Merge pull request #135 from basho/slf-new-generators

Make updates to key generators and example config files
Merge pull request #132 from lucafavatella/fix-warning-for-tests-dir

Fix warning when running make on freshly cloned repo
Merge pull request #133 from lucafavatella/test-more-otp-versions

Test more OTP versions