add dom\ extension.js

Signed-off-by: arcticlion <david.malan@aol.com>
write a Function getInnerText in dom\ extension.js

Signed-off-by: arcticlion <david.malan@aol.com>
write a Function setInnerText in dom\ extension.js

Signed-off-by: arcticlion <david.malan@aol.com>
write a Feature innerHTML in dom\ extension.js

Signed-off-by: arcticlion <david.malan@aol.com>
write a Feature performanceOfInnerText in dom\ extension.js

Signed-off-by: arcticlion <david.malan@aol.com>
merge master and dev