feat: update the dependencies

Update some dependencies:
- Istanbul: 0.2.10
- ibrik: 1.1.1
- dateformat: 1.2.3
chore: update Travis configuration

Updates NPM before installing the dependencies.
Merge pull request #78 from karma-runner/update-istanbul

feat: update some dependencies
chore: release v0.2.2
feat(config): instrumenter override option

Enable fine-tuning which preprocessor should be used for which files
Add README.md section
Add tests
Update existing tests to comply with new dependency requirement
Merge branch 'instrumenter-option' of github.com:gvarsanyi/karma-coverage into gvarsanyi-instrumenter-option

Conflicts:
	package.json
Merge branch 'gvarsanyi-instrumenter-option'
chore: release v0.2.3
fix: optional option no longer trigger an error when omitted

The `coverageReporter.instrumenter` object can be passed to the karma
configuration to override the automatic instrumenters inferring (since this
[PR]). However, when the `coverageReporter` key was omitted, a type error was
emitted.

[PR]: https://github.com/karma-runner/karma-coverage/pull/79
Merge pull request #81 from karma-runner/fix-omitted-option-error

fix: optional option no longer trigger an error when omitted
chore: release v0.2.4
chore(dependencies): update istanbul to 0.3.0

use new features like reporters e.g. json-summary
feat: new `subdir` option

We discussed in this [issue] about the problem of not being able to choose the
complete output directory.

This commit addresses this issue and add the new `subdir` option which allows to
specify the full output directory of each coverage report.

[issue]: https://github.com/karma-runner/karma-coverage/pull/62
Merge pull request #90 from karma-runner/configurable-subdir

feat: new `subdir` option
chore: release v0.2.5
fix: reporters can be configured individually

The `subdir` option previously introduced in karma-coverage 0.2.5 brings a
regression: it wasn't possible anymore to configure a specific output
directory/subdirectory for each reporter. This fix makes it possible again.

Fix #91
Merge pull request #92 from karma-runner/fix-individual-dir-subdir

fix: reporters can be configured individually
use  svg badge by default
Merge pull request #93 from sahat/patch-1

use  svg badge by default
Merge pull request #88 from robinboehm/master

chore(dependencies): update istanbul to 0.3.0