Sync \w Github Linguist v7.2.0
Includes new way of handling `heuristics.yml` and
all `./data/*` re-generated using Github Linguist [v7.2.0](https://github.com/github/linguist/releases/tag/v7.2.0)
release tag.
- many new languages
- better vendoring detection
- update doc on update&known issues.
* exclude build artifacts from git
* build: simplify building by using src-d/ci
* bench: simplify&fix shell runners
* build: simplify benchmarks* targets
* test: remove dependency on single test suite
* doc: rel image link + linguist cli difference highlight
* suggestions from code review
* bench: add fail fast to all shell runners
Signed-off-by: Alexander Bezzubov <bzz@apache.org>
This allows to use a cached directory with linguist instead of cloning and speeds up the tests by -10s on my local machine.
Signed-off-by: Vadim Markovtsev <vadim@sourced.tech>
renamed tmpLinguist to repoLinguist and SimpleLinguistTestSuite to EnryTestSuit in common_test.go
changed receiver's name for TestSuites to 's'
fixed comments
