web components: improve the binding of HOT configuration to custom element properties
web components: make sure that only functions and arrays are processed as plugin hooks
web components: check for null values which are assigned by Polymer version of HOT
web components: unify isEmptyRows/isEmptyCols (move them to config)
web components: improve the binding of <handsontable-column> configuration to custom element properties
web components: improve the binding of <handsontable-column> configuration to custom element properties
upgrade Polymer to 0.1.2
web components: rename 'title' attribute to 'header' because 'title' was causing problems (https://groups.google.com/forum/#!topic/polymer-dev/RMMsV-D4HVw)
Merge branch 'feature/web-component-fixes' into develop
remove italic from readOnly cell default style
add indexOf shim which is needed by Jasmine reporter (tests were broken in IE8 since revision 4510c01 - Dec 19, 2013)