Ignition is a multi-module project that consist of a group of projects which has inter-module dependencies with each other:
ignition/
ignition-core/
ignition-core-lib/
ignition-core-samples/
ignition-core-tests/
pom.xml
ignition-location/
ignition-location-lib/
ignition-location-samples/
ignition-location-tests/
pom.xml
ignition-support/
ignition-support-lib/
ignition-support-samples/
pom.xml
pom.xml
Suppose you use Eclipse and has m2e and m2e-android plugins installed. You need import all projects as a group into Eclipse by using File -> Import ... -> Maven -> Existing Maven Projects and choose ignition/ as the root project folder.
Without modifying the pom.xml (break the structure of multi-module projects), you can't import and use ignition-core/ independently in Eclipse.