fixed installer log dir and README

Author: Italtel-Unimi

service-mapper/README.md

@@ -31,7 +31,7 @@ Start with:
 ```
 sudo apt-get update
 
-sudo apt-get install -y make g++ ruby bundler zlib1g zlib1g-dev
+sudo apt-get install -y make g++ ruby bundler zlib1g zlib1g-dev git
 ```
 
 which updates the vm OS and installs the required dependencies.
@@ -60,7 +60,7 @@ sudo ldconfig
 
 #### Using the installer script
 
-After the source has been cloned from the repository (this may require the installation of the git package), you can run
+After the source has been cloned from the repository, you can run
 
 ```
 ./install.sh
@@ -96,6 +96,13 @@ Eventually, for solving any issue with gem dependencies, try running:
 gem install bundler
 ```
 
+Also, error may be thrown in case of missing TeNOR-Mapper/log directory. It can be fixed with:
+
+``` 
+mkdir TeNOR-Mapper/log
+
+```
+
 
 ### API Documentation
 A wiki page will be available shortly.

service-mapper/install.sh

@@ -205,6 +205,11 @@ then
     exit 1
 fi
 
+# Create log directory
+if [ ! -d "$HOME/TeNOR-Mapper/log" ]; then
+    mkdir $HOME/TeNOR-Mapper/log
+fi
+
 echo
 echo
 echo