Remove Slf4j dependency from json-path

This reduces the dependency convergence problems with slf4j when using
json-path in other projects.

json-path-web-test still requires it and the API definition has been
relocated there.

json-path-web-test/build.gradle

@@ -30,6 +30,7 @@ dependencies {
     compile project(':json-path')
     compile 'commons-io:commons-io:2.4'
     compile libs.jacksonDatabind
+    compile libs.slf4jApi
     compile 'io.fastjson:boon:0.33'
     compile 'com.nebhale.jsonpath:jsonpath:1.2'
     compile 'io.gatling:jsonpath_2.10:0.6.4'

json-path/build.gradle

@@ -15,7 +15,6 @@ jar {
 
 dependencies {
     compile libs.jsonSmart
-    compile libs.slf4jApi
     compile libs.jacksonDatabind, optional
     compile libs.gson, optional