Use BlockdownloadPane from wallettemplate
Use custom Download indicator, fix problems with testnet
Add testnet and main net fee addresses
Fix URL for screencasts
Use regtest
Remove obsolete 'apply plugin' Gradle directives

 - The 'java' plugin is added implicitly by the gradle/javafx.gradle
   script, so there is no longer a need to explicitly apply it.

 - The 'application' plugin is no longer necessary now that we are
   building native installers with the javafx plugin.
Configure asciidoctor-gradle-plugin

Based on instructions at:

 - https://github.com/asciidoctor/asciidoctor-gradle-plugin#installation

With the following as "hello world" Asciidoc content:

 - https://gist.github.com/mojavelinux/9a8d3f1d32a8f0656a42

Usage:

 - Run `./gradlew asciidoc`
 - Open `build/asciidoc/hello.html`

See #91
Remove screenshots

In preparation for work on #91, remove no longer referenced screenshots
that are, in many cases out of date anyway.
Move doc => docs

In preparation for work on #91.
Move Gradle JavaFX config to bottom of build file
Customize asciidoc source and output dirs

Use source and output dirs named 'docs' vs. the default 'asciidoc'.

See #91
Introduce developer guide

 - Port instructions for building from source from Markdown to Asciidoc
 - Make these instructions one section in a larger 'developer guide'
   document. Done for symmetry with the user guide forthcoming in #91.
WIP docs/userguide.adoc
Add version number to user and dev guides

 - Assign ":revnumber:" header attribute using the {project-version}
   attribute automatically passed into asciidoctor by the Gradle plugin.

 - Also configure headings to render with numbers using the ":numbered:"
   header attribute.

See #91
Use two-line title asciidoc markup

Per http://asciidoc.org/userguide.html#_two_line_titles

See #91
Test asciidoc cross-reference links
Revert "Test asciidoc cross-reference links"

This reverts commit 26832debdd2fb35714dfbd025be37a5e91cf7ab0.
WIP userguide
WIP: userguide
Replace 'publish offer' language with 'place offer'