Made readme file sections and documentation more consistent.

doc/building.md

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+# Building
+
+`plasp` requires a C++14 compiler (preferrably GCC ≥ 6.1 or clang ≥ 3.8), the `boost` libraries (≥ 1.55), and CMake for building.
+
+```bash
+$ git clone https://github.com/potassco/plasp.git
+$ cd plasp
+$ mkdir -p build/release
+$ cd build/release
+$ cmake ../.. -DCMAKE_BUILD_TYPE=Release
+$ make
+```
+
+The built `plasp` binary is then located at `plasp/build/release/bin/plasp`.
+
+To update `plasp` to the most recent version, perform the following steps:
+
+```bash
+$ cd plasp
+$ git pull
+$ cd build/release
+$ cmake .
+$ make
+```
+
+## Running the Tests
+
+`plasp` provides unit tests written using the [Google Test](https://github.com/google/googletest) framework.
+Before building and running the tests, make sure you have fetched the Google Test git submodule:
+
+```bash
+$ git submodule init
+$ git submodule update
+```
+
+Afterward, enable the flag `BUILD_TESTS` in your CMake configuration.
+Finally, build and run the tests as follows:
+
+```bash
+$ make run-tests
+```
+
+After updating `plasp`, make sure to execute CMake again in order for the tests to run correctly.
+Else, external files required by the test suite may be reported missing.