1) Prerequisites:

sudo apt-get install libjpeg62 libwebkitgtk-1.0-0 git-core

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

2) Download Aptana Studio: http://www.aptana.com/products/studio3/download

3) Extract Aptana Studio

sudo unzip [name of Aptana Studio ZIP file here].zip -d /opt

4) Add shortcut

create file AptanaStudio3.desktop with content:

[Desktop Entry]
Version=1.0
Encoding=UTF-8
Name=Aptana Studio 3
GenericName=Integrated Development Environment
Comment=Aptana Strudio 3 Integrated Development Environment
Exec=/opt/Aptana_Studio_3/AptanaStudio3 %F
TryExec=/opt/Aptana_Studio_3/AptanaStudio3
Icon=/opt/Aptana_Studio_3/icon.xpm
StartupNotify=true
StartupWMClass="Aptana Studio 3"
Terminal=false
Type=Application
MimeType=text/xml;application/xhtml+xml;application/x-javascript;application/x-php;application/x-java;text/x-javascript;text/html;text/plain
Categories=GNOME;Development;IDE;

sudo mv AptanaStudio3.desktop /usr/share/applications/AptanaStudio3.desktop