Install instructions updates (#171)

* Install instructions updates

* Update README.md

* also need pip

* need to update, plus compact a few things

* add -y

* grammar?

* typos

* Add bountysource link

* consistency

* Point users to the examples dir and wiki

I thought these links were cluttering things a bit, and 2 out of 3 of
them aren’t official documentation yet we’re linking to them in the
first line of the README. I updated the wiki to address these directly
in a way I think is more clear.

* link to Z3 releases

* oops, don't know where that came from

* ensure people run the latest pip

* be more explicit

* Add an Issue Template

* be more explicit

* no longer appropriate here

* unnecessary

* add note about 16.04

* move issue template to hidden folder

* Spelling

* be explicit, makes copy/paste easier

examples/linux/basic.c

@@ -1,5 +1,5 @@
-/* Minimal toy example with input output using libc
- * Symbolic values are read from stdin using standar libc calls. 
+/* Minimal toy example with input/output using libc
+ * Symbolic values are read from stdin using standard libc calls. 
  *    
  * Compile with :
  *   $ gcc toy002-libc.c -o toy002-libc
@@ -26,7 +26,7 @@ int main(int argc, char* argv[], char* envp[]){
     }
     else 
     {
-        printf("Message: It is smaller or equal than 0x41\n");
+        printf("Message: It is less than or equal to 0x41\n");
     }
 
 return 0;