Provide examples for new languages

[bzz]

depends on issue #89 → PR #122

Bblfsh has 6 recommended drivers in beta state, according to https://doc.bblf.sh/languages.html#supported-languages

Dashboard should catch up and have at least one example of each of those by default.

Thus Golang, Ruby, PHP and JavaScript need to be added.

[dennwc]

Might be related to https://github.com/src-d/issues-infrastructure/issues/150

[dpordomingo]

it might be also related to #89

we could reserve some time next week to ensure these three issues have been solved:

• (a) update server src-d/issues-infrastructure#150
• (b) provide examples for the new languages Provide examples for new languages #119 (this one)
• (c) make the drop-down "dynamic", calling the server to fetch available drivers Recover driver list from gRPC and not have a fixed list #89

once (c) has been completed, every time a new driver is developed, it would be only needed to do (a); and (b) if it is needed an example for that new language

[dpordomingo]

Examples provided by #123