Updated install docs with respect to default build settings

docs/install.md

@@ -10,8 +10,9 @@ sudo apt-get install clang-format-3.6 || sudo apt-get install clang-format-3.5
 Get juCi++ source, compile and install:
 ```sh
 git clone --recursive https://github.com/cppit/jucipp
-cd jucipp
+mkdir jucipp/build
-cmake .
+cd jucipp/build
+cmake ..
 make
 sudo make install
 ```
@@ -25,8 +26,9 @@ sudo apt-get install git cmake make g++ libclang-3.6-dev clang-format-3.6 pkg-co
 Get juCi++ source, compile and install:
 ```sh
 git clone --recursive https://github.com/cppit/jucipp
-cd jucipp
+mkdir jucipp/build
-cmake .
+cd jucipp/build
+cmake ..
 make
 sudo make install
 ```
@@ -41,8 +43,9 @@ pacman -S git cmake make clang gtksourceviewmm boost aspell aspell-en
 Get juCi++ source, compile and install:
 ```sh
 git clone --recursive https://github.com/cppit/jucipp
-cd jucipp
+mkdir jucipp/build
-cmake .
+cd jucipp/build
+cmake ..
 make
 # as root
 make install
@@ -57,8 +60,9 @@ brew install cmake --with-clang llvm pkg-config boost homebrew/x11/gtksourceview
 Get juCi++ source, compile and install:
 ```sh
 git clone --recursive https://github.com/cppit/jucipp
-cd jucipp
+mkdir jucipp/build
-cmake .
+cd jucipp/build
+cmake ..
 make
 make install
 ```
@@ -72,8 +76,9 @@ pacman -S git mingw-w64-x86_64-cmake make mingw-w64-x86_64-toolchain mingw-w64-x
 Get juCi++ source, compile and install (replace `mingw64` with `mingw32` for 32-bit MSYS2 installs):
 ```sh
 git clone --recursive https://github.com/cppit/jucipp
-cd jucipp
+mkdir jucipp/build
-cmake -G"MSYS Makefiles" -DCMAKE_INSTALL_PREFIX=/mingw64 .
+cd jucipp/build
+cmake -G"MSYS Makefiles" -DCMAKE_INSTALL_PREFIX=/mingw64 ..
 make
 make install
 ```
@@ -98,11 +103,6 @@ make install
 Note that we are currently working on a Windows-version without the need of an X-server.
 -->
 
-## Cleanup CMake cache files (in case you want to try out juCi++ on its source files)
-```sh
-rm -r CMakeFiles CMakeCache.txt
-```
-
 ## Run
 ```sh
 juci