Minor bug fixes, adding spotify music player, and adding sphinx documentation

doc/source/netscriptdatatypes.rst

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+Netscript Data Types and Variables
+==================================
+
+
+Data Types
+----------
+Netscript supports three primitive data types:
+
+**Numbers** - Positive numerics, such as integers and floats. Examples: 6, 0, 10.5
+
+**Strings** - A sequence of characters that represents text. The characters must be encapsulated by single or
+double quotes. Example: "This is a string" or equivalently 'This is a string'.
+*Strings are fully functional* `Javascript strings <https://www.w3schools.com/jsref/jsref_obj_string.asp>`_,
+*which means that all of the member functions of Javascript strings such as toLowerCase() and includes() are also available in Netscript!*
+
+**Boolean** - true or false
+
+**Array** - An array is a special container object that is capable of holding many different values. Arrays are simply Javascript
+arrays, and most Javascript array methods can be used in Netscript as well (join(), pop(), splice(), etc.). You can read more about
+`Javascript arrays here <https://www.w3schools.com/js/js_arrays.asp>`_
+
+Variables
+---------
+
+Variables can be thought of as named containers. Their purpose is to label and store data. The data stored in the
+variable can then be accessed and changed by referring to the variable's name. The name of a variable must start with
+either a letter or an underscore. The rest of the variable name can contain any alphanumeric (letters and numbers),
+as well as hyphens and underscores.
+
+The Netscript language is untyped, meaning that any variable can hold any of the data types above. The value type of a variable
+can also change. For example, if a variable initially holds a number, it can later hold a string.
+
+The following shows how you can declare and initialize variables::
+
+    i = 1;
+    s = "This is a string";
+    b = false;
+
+After declaring a variable, the values in variables can be used simply by referencing the name. For example::
+
+    j = i + 5;
+    s2 = s + " Adding more letters onto the string"
+
+The first command above will store the value 6 in the variable j. The second command will store the string "This is a string Adding more letters onto the string" into the variable s2.