feat (audience match types): Condition Evaluator, Project Config, and Audience combinations PRs consolidation.

[rashidsp]

Summary

• feat (audience match types): Update condition evaluator for new audience match types (feat (audience match types): Update condition evaluator for new audience match types. #145)

• feat (audience match types): Update audience evaluator and project config for new audience match types (feat (audience match types): Update audience evaluator and project config for new audience match types. #146)

• feat(audiences): Audience combinations (feat(audiences): Audience combinations #147)

• feat(attribute_value): Don't target NAN, INF, -INF and > 2^53 (feat(attribute_value): Don't target NAN, INF, -INF and > 2^53 #148)

Build issue:

• For Ruby 2.3 or higher, need to upgrade to Bundler 2.0 by adding https://docs.travis-ci.com/user/languages/ruby/#bundler-20

• Bundler installation can take a while, slowing down the build. Travis CI can cache the installed bundle. https://docs.travis-ci.com/user/languages/ruby/#caching-bundler

[coveralls]

Coverage remained the same at 100.0% when pulling 37872e6 on rashid/audience-match-types into e848bf5 on master.

[coveralls]

Coverage remained the same at 100.0% when pulling 8453091 on rashid/audience-match-types into 360ca22 on master.

[mikeproeng37]

Results of running the Audience Match types tests from the compat-suite (they all pass!): https://travis-ci.com/optimizely/fullstack-sdk-compatibility-suite/jobs/168738056

[juancarlostong]

this fixes:

ERROR:  Error installing bundler:
	bundler requires RubyGems version >= 3.0.0. Try 'gem update --system' to update RubyGems itself.
The command "gem install bundler" failed and exited with 1 during .```

[mikeproeng37]

lgtm

[mikeproeng37]

@juancarlostong can you review the changes to the travis file here? The details are in the description of the PR itself.