remove jdiff and scripts; add documentation

.gitignore

apidiff.py

...scripts/APIUpdate/APIUpdate-1.0-jar-with-dependencies.jar

release_scripts/APIUpdate/README.md

release_scripts/APIUpdate/pom.xml

...in/java/org/sleuthkit/autopsy/apiupdate/CLIProcessor.java

thirdparty/jdiff/v-custom/.cvsignore

thirdparty/jdiff/v-custom/LICENSE.txt

thirdparty/jdiff/v-custom/README.txt

thirdparty/jdiff/v-custom/doc/CHANGES.txt

thirdparty/jdiff/v-custom/doc/JDiffArticle.pdf

thirdparty/jdiff/v-custom/doc/KNOWN_LIMITATIONS.txt

thirdparty/jdiff/v-custom/doc/TODO

thirdparty/jdiff/v-custom/doc/dev_notes.txt

thirdparty/jdiff/v-custom/doc/index.html

thirdparty/jdiff/v-custom/doc/jdiff.html

thirdparty/jdiff/v-custom/doc/stylesheet.css

thirdparty/jdiff/v-custom/index.xhtml

thirdparty/jdiff/v-custom/jdiff.jar

thirdparty/jdiff/v-custom/lib/2000/10/XMLSchema