several fixes

[timotheecour]

/cc @yglukhov @SSPkrolik

• test/document Bson(string) to string
• fixes nimble test should run test suite #54
• fixes nimongo/mongotest.nim fails: ~/.nimble/pkgs/scram-0.1.6/scram/private/utils.nim(17, 13) Error: undeclared identifier: 'MD5Digest' #56
  EDIT
• fixes pre-existing bug in .travis.yml (was previously not really testing anything)
• add nimble test, nimble test_ci commands to test with or without mongod

[yglukhov]

You forgot to change .travis.yml and I wonder how tests succeeded :/

[timotheecour]

hmm, indeed, nim c -r nimongo/bsontest is mentioned in .travis.yml and doesn't fail... sounds like a pre-existing bug

[timotheecour]

@SSPkrolik @yglukhov I tested locally (based on output from https://travis-ci.com/timotheecour/nimongo/jobs/159187423) , it turns out travis.yml is buggy, can we please merge this and figure out travis after?

mkdir /tmp/d02 && cd /tmp/d02
git clone --depth=50 --branch=master https://github.com/timotheecour/nimongo.git timotheecour/nimongo
docker pull yglukhov/nim-base

# passes
docker run -v "$(pwd):/project" -w /project yglukhov/nim-base run "nimble install -y && nim c -r nimongo/bson && nim c -r nimongo/bsontest"

# also passes, with random string
docker run -v "$(pwd):/project" -w /project yglukhov/nim-base run "nimble install -y && nim c -r nimongo/bson && nim c -r adfasfjalfjaslfjasdlfjalsjfalsjfasljfalsdfj"

[timotheecour]

@SSPkrolik @yglukhov
PTAL, I fixed travis, there was a pre-existing bug (run vs bash); also I adapted travis to run nimble test_ci so we can test both nimble test (locally, if there's a mongod server) vs nimble test_ci

in a future PR, we should make travis run nimble test and add dependency on mongod in travis => #62

[timotheecour]

/cc @yglukhov I added some commits ; lemme know if u want these in another PR

[timotheecour]

ping

[SSPkrolik]

@timotheecour thanks a lot for the contribution!