Cleaning code,Formating and replacing var with let to mamek typescrip…

[enyachoke]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Just code cleanup because lint was filling my logs with unnecessary warnings
• What is the current behavior? (You can also link to an open issue here) When I import the package on a project with typescript lint it raises warnings about formatting an the use of var
• What is the new behavior (if this is a feature change)? Currently lint no longer raises lint warning
• Other information: Am on linux ubuntu Chrome 51.0.2704. …t lint happy

[akserg]

Thank you.