Use Git submodules instead of git clones at pull time

.github/download-dependencies.sh

@@ -1,7 +1,3 @@
 #!/bin/bash
-mkdir -p import
-git clone https://github.com/benibela/flre.git import/flre
-mkdir -p import/pasdblstrutils/src && curl https://raw.githubusercontent.com/BeRo1985/pasdblstrutils/master/src/PasDblStrUtils.pas > import/pasdblstrutils/src/PasDblStrUtils.pas
-git clone https://github.com/benibela/ararat-synapse.git import/synapse
-git clone https://github.com/benibela/rcmdline.git rcmdline
-git clone https://github.com/benibela/internettools.git internettools
+git submodule init
+git submodule update

.gitmodules

@@ -0,0 +1,15 @@
+[submodule "import/flre"]
+	path = import/flre
+	url = https://github.com/benibela/flre.git
+[submodule "import/synapse"]
+	path = import/synapse
+	url = https://github.com/benibela/ararat-synapse.git
+[submodule "rcmdline"]
+	path = rcmdline
+	url = https://github.com/benibela/rcmdline.git
+[submodule "internettools"]
+	path = internettools
+	url = https://github.com/benibela/internettools.git
+[submodule "import/pasdblstrutils"]
+	path = import/pasdblstrutils
+	url = https://github.com/BeRo1985/pasdblstrutils

README.md

@@ -38,11 +38,8 @@ Screenshots
 </p>
 
 Compilation and Installation
------------
+----------------------------
 
 You can compile it by calling `build.sh` and install it by calling `build.sh -t`. Alternatively you can compile it with the Lazarus IDE.
 
-You can call the commands from the [.travis.yml](.travis.yml) script to download dependencies.
-
-
-
+Don't forget to pull git submodules (see `.github/download-dependencies.sh` script) to download dependencies.