Headless execution capability for Chrome and Firefox

[noronhaa]

Implement headless execution capability for Chrome and Firefox

[ham1]

Make sure we add docs and the property to the example yaml files.

[noronhaa]

Added some javadocs and properties were already added to the main docs

[ham1]

I'd like to upgrade to Selenium 2.7.1 and then try again with this feature, as we can no longer use DesiredCapabilities and we can use FirefoxOptions and ChromeOptions.

[codecov]

Codecov Report

Merging #79 into master will increase coverage by 0.23%.
The diff coverage is 52.63%.

@@             Coverage Diff              @@
##             master      #79      +/-   ##
============================================
+ Coverage     36.58%   36.81%   +0.23%     
- Complexity      273      275       +2     
============================================
  Files            59       58       -1     
  Lines          1774     1779       +5     
  Branches        169      170       +1     
============================================
+ Hits            649      655       +6     
+ Misses         1039     1036       -3     
- Partials         86       88       +2

Impacted Files	Coverage Δ	Complexity Δ
...kium/core/ui/driver/drivers/LegacyFirefoxImpl.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...rkium/core/ui/driver/drivers/BrowserStackImpl.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...m/core/ui/driver/drivers/InternetExplorerImpl.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...meworkium/core/ui/driver/drivers/ElectronImpl.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...frameworkium/core/ui/driver/drivers/SauceImpl.java	0% <ø> (ø)	0 <0> (ø)	⬇️
.../frameworkium/core/ui/driver/drivers/GridImpl.java	50% <ø> (ø)	3 <0> (ø)	⬇️
...rameworkium/core/ui/driver/drivers/SafariImpl.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...a/com/frameworkium/core/ui/driver/DriverSetup.java	58.92% <100%> (+1.03%)	16 <0> (ø)	⬇️
...rameworkium/core/ui/driver/drivers/ChromeImpl.java	44.44% <20%> (-5.56%)	2 <0> (ø)
.../frameworkium/core/common/properties/Property.java	86.56% <50%> (-0.94%)	17 <3> (+2)
... and 1 more

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