Updates tutorials (general fixes, link to solutions repos)

* Updates tutorial to make imports to be added clearer, and to reflect new repo structure.
* Adds links to the solution repos for tut 1.
* Further fixes based on dry-run.

docs/source/example-code/build.gradle

@@ -33,6 +33,7 @@ dependencies {
     compile project(':core')
     compile project(':client:jfx')
     compile project(':node-driver')
+    compile project(':webserver')
     testCompile project(':verifier')
     testCompile project(':test-utils')