Update jquery.searchinput.js

1)- Fixed clear icon show when page loads and the input field has a text like:

       <input type="text" value="default search terms">

2)- Fixed MutationObserver error in Internet explorer 10 which does not exist by adding:

			function nop() { }
			if (!window.MutationObserver) {
				window.MutationObserver = function () {
					this.observe = nop;
					this.disconnect = nop;
				};
			}

3)- Added option settings to show/hide the search magnify image if for example the input field is not used for search, this is good to use the clear button only for regular text fields:

To show the search icon magnify image:

$('.clearable').clearInput({'magnify' : true});

To hide the search icon magnify image:

$('.clearable').clearInput({'magnify' : false});

4)- disable clear button in Internet Explorer 10 'x' by adding css:
    <style>
        /* disable clear button in Internet Explorer 10 'x' */
        input[type=text]::-ms-clear {display: none;}
    </style>