Use make variable instead of environment variable
lmdb is an optional dependency
Remove unused endianness check

All it did was to set WORDS_BIGENDIAN if successful
but we don't use that anywhere in the code.
Automake doesn't support wildcards

And this makes distuninstallcheck fail.
Merge pull request #1585 from rubenk/remove-wildcard

Automake doesn't support wildcards
Merge pull request #1584 from rubenk/remove-unused-check

Remove unused endianness check
Merge pull request #1581 from rubenk/travis-tweak

Use make variable instead of environment variable
Merge pull request #1582 from rubenk/optional-lmdb

lmdb is an optional dependency
Convert rapidjson to autotools

So that it properly handles silent rules,
make distclean etc.
Merge pull request #1583 from rubenk/autotoolify-rapidjson

Convert rapidjson to autotools
Implement a zone import through the API
Merge pull request #1532 from tuxis-ie/api-zone-import

Api zone import
allow dynamic module loading on OSX - apparently this works since 10.3/10.4
drop intention to switch to libltdl