java binding documentation fix

Gpufit/java/gpufit/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip

docs/installation.rst

@@ -34,6 +34,7 @@ updated Nvidia graphics driver. The binary package contains:
 - Matlab 32 bit and 64 bit bindings, with Matlab examples.
 - Python version 2.x and version 3.x bindings (compiled as wheel files) and
   Python examples.
+- Java 8 32 bit and 64 bit bindings, with Java examples.
 - This manual in PDF format.
 
 To re-build the binary distribution, see the instructions located in 
@@ -71,6 +72,8 @@ The following tools are required in order to build Gpufit from source.
 * Boost_ 1.58 or later (required if you want to build the tests)
 * MATLAB_ if building the MATLAB bindings (minimum version Matlab 2012a)
 * Python_ if building the Python bindings (Python version 2.x or 3.x)
+* Java if building the Java bindings (minimum Java JDK version 8)
+* PDF Latex installation (like Miktex) if converting the documentation from Latex to PDF
 
 Source code availability
 ------------------------