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sel code block line number (#2612)

* sel code block line number

as markdown begin code block:
```js   -> js code block without line number
```js=  -> js code block with line number, start in 1
```js=3 -> js code block with line number, start in 3

* define line number by str.split('=')

* fix lang include '='

* for compatible origin version

* add unit test for setup firstLine inline

* add unit test, don't care first line number as line number false

* fix coding style

* modify dist: trusty in travis.yml

* modify dist: precise in travis.yml

* fix for jscs

* add unit test, add coverage as codearea set js

1746 of 1935 branches covered (90.23%)

7 of 7 new or added lines in 1 file covered. (100.0%)

3863 of 3976 relevant lines covered (97.16%)

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